Agree with Mark, lose a pile of unnecessary luggage, and ride two up. A sidecar is HEAVY, and much harder to do right/safely than it looks. A bad sidecar rig is a nightmare. And it will also encourage you to take more junk you don't need, and did I mention a sidecar rig is HEAVY? And same goes for trailers.
Susan and I did fine, as did MANY MANY other people, two up, on both small bikes and big bikes. It's all down to getting the luggage reduced to what you MUST HAVE.
I KNOW you have too much luggage right now!! If you can't get it all into a pair of soft saddlebags and and a 30-40 liter roll-bag across the back, it's too much stuff.
Strip the load to what you use everyday - and that's it.
You COULD add a pair of tank panniers, but that's adding weight you don't need just to carry stuff you almost certainly don't need.
Remember that you are on a road, and there are towns everywhere along the road, and people live in them - and guess what, they need much the same as you. You can always buy another sweater / jumper, or pair of pants and food along the way. If you're not in a hurry, you can wait for repairs or parts too, no need to carry them.
Best of luck! We look forward to hearing how you do.
Number one phrase every traveller ever has said:
"I just sent another box full of stuff I didn't need home"