@OlyLo: What nobody has asked is why do you want a small capacity adventure bike?

Are you looking for light weight? Or for decent fuel economy? Or do you prefer to be on a less powerful bike?

Lower capacity doesn't always equate to lower weight, I believe I'm right in saying the kerb weight of the KTM 390 Adventure is 172kg against the 150kg of the KTM 690 Enduro that I use for long distance on/offroad touring.

If you have to do lots of mods you really don't know how it will turn out and of course you have to tell your insurance company otherwise the insurance might be invalidated. I prefer buying bikes that are 90% there in terms of specification. Personally I wouldn't consider buying a bike that needed the suspension changed, or having to add fuel tanks to get a reasonable range.

Sensible changes for you might be a raised and extremely comfortable gel seat and lowered pegs. But then you will be up in the airstream and might need better wind protection—maybe a touring screen with wind deflector added on top.

Top of my 'must have' list for the last few years has been tubeless tyres for ease of puncture repair and I understand the new RE Himalayan 450 will have these on export models. But it's no lightweight at 195kg kerb weight. My KTM 790 Adventure twin at 205kg kerb weight also has tubeless tyres.

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"For sheer delight there is nothing like altitude; it gives one the thrill of adventure
and enlarges the world in which you live," Irving Mather (1892-1966)