Seat Height Increase

What about longer rear shocks?
An aftermarket seat upholsterer could soon recover the old unit with additional foam inside if that's what you want.
I have a 2019 900 and I find I tend to slump on it. Sometimes this can be comfortable but other times I feel my posture isn't quite right.
Maybe also consider handlebars, both in height as in bend profile, but rotation as well.

Small adjustments all add up to a more personal comfortable position.

 

@Sam Wells Yes a company called RK LEIGHTON will build your seat to exactly what you want. I did also read somewhere that you can get adjustable foot pegs. And as @Eldon said there are many ways to adjust the position. If that is of course you want to keep the bike. Other than that test the other bikes like the street scrambles version and variants.