I 'd go at it a different way. First decide where you want to ride and then look at the equipment.

I'd also recommend flying to somewhere like SE Asia (Philippines, Thailand, Vietnam et al), renting one of the cheap 125 to 200cc scooters / underbones / motorcycles) that are available for $6 to 10 per day, and head out.
You really don't need much gear for that, a set of throw-over saddlebags, maybe a small backpack or seat bag, a lightweight rain jacket and maybe pants, and basic riding gear, a helmet, MX gloves, mesh jacket and hiking boots will be far more than the locals are using, and probably in line with the speeds traffic moves at.

No need for camping gear as lodging is cheap and available as long as you don't expect western quality hotels. At most, take a mosquito hammock and silk or microfleece bag liner for emergencies.

Clothing can be limited to a few sets of quick drying synthetic shirts, shorts and maybe some long pants, and a set of flip flops or sandals for off the bike.

Then head out for the most remote destinations you can find, catching the small local bancas / ferries across rivers or between islands.

Other destinations for fly and ride adventures are Southern Africa and South America, which are more big bike friendly, but could require more planning and are more expensive.

If you still think you need a fully kitted GS when you get back, you've spent less than cost of carnet / insurance and shipping to do the same trip.
If not, you've just saved many thousands of $$...

For camping, you could start building up a kit using your current bike. I prefer good quality backpacking gear, but not the ultra lightweight stuff which tends to be expensive, not that robust and not very spacious.

For example, the Nemo Losi 3P tent I use now weighs only 1 lb more than the 2P, and the same as my previous 2 man tent, but has almost double the floor and vestibule space. It's 3/4 season capable, but with the extensive mesh inner and two doors has excellent airflow for tropical conditions.
I got it at a 30% discount, so it cost me a fraction of the 'motorcycle' specific tents some on that other adventure forum recommend...

Any good hiking / outdoor shop should be able to give advice on gear, but remember they also need to make a buck, so will tend to push the latest and greatest.

For stoves and stuff, I like basic and cheap. I'm still using a Trangia knockoff alcohol stove that's 25 years old, and packs 2 pots, fry pan, windshield and stand, stove, potholder and lighter into a space not much bigger than 1 of the pots.

Unless I'm camping with a partner, I just use one of the pots or fry pan as a plate, and have an old stainless army cutlery set that fits in the Trangia as well.

One advantage of camping off the S1000, is that you will slowly acquire and test out a compact camping setup without being tempted to go for the ginormous luggage / travel systems that are seen on the 'adventure' tourers all too often.

For gear, I don't find that the bells and whistles do it all adventure riding gear works all that well in the tropics, and no better than a well layered simple riding suit in cold conditions.

I've had the expensive, multilayered, waterproof stuff, and now use either a very simple mesh jacket or compression jacket (MX style) and a cheap and simple enduro pants with zip-off legs and really good venting, for mostly tropical riding.
A simple, very packable, lightweight hiking shell and bicycle rain pants work about as well as anything else to keep the rain out, and breathe very well.

With a few good under/mid fleece layers, the same setup will deal with 99% of the conditions I experienced in colder climates such as the northern US.

I guess what I'm saying is that you already have a bike, you already have some gear, you obviously have a fair bit of disposable income, so get out there and get your feet wet, build up experience and knowledge and a starter kit before spending a ton of money on what could be the wrong direction.

Just an addendum on the gear thing. I've been riding / driving in SE Asia for almost 7 years, and in Southern / central Africa for many years before that.

Nearly all the accidents I've had in SE Asia were covered by a lightly armored mesh jacket or MX compression jacket (better, as it has back, chest, shoulder, elbow and arm hard armor yet is as cool as a mesh jacket), Cordura shorts and over ankle boots. Plus helmet and MX style leg protectors.

Having said that, the other day I was out in ATTGATT, wearing my BMW Santiago boots, and had a bus go over my foot and knock the bike sideways by way of my knee, trying to push me out of the way in traffic.
Likely I would have been OK in a less robust boot, but probably much more bruised.

Also, if I'd been on something the size and weight of a GS instead of a 200 cc dualsport, likely my knee would have been crushed and I wouldn't have been able to keep the bike upright and turn/accelerate a bit to avoid the rest of the vehicle going over my leg and bike.

As a new rider in these conditions, the chances of an accident are extremely high. Slippery, broken roads, lots of stuff in or running across the road anywhere and any time without warning, substandard equipment (cheap tires, poor maintenance and more) and a totally different rhythm and reason to traffic 'rules' and flow.
So you may want to consider the protection perspective as well as climate, at least until you have a year or two experience in local conditions.

In that sense, South Africa is a bit closer to the western norms.

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