The rear sub-frame won't fit. Mod the sub-frame or sub-frame mounting points on the frame and it could be done.
You'll have to find a friend with a SMR or SER and try to swap tanks to see if things could fit without too much modification. I think the top tank mount area will need to be modded. A new seat base to fit the tank could be fab'd up from fiberglass if the SD sub-frame was kept with the SMR/SER tank. lots of work but could be worth it if your looking to get farther up on the bike.
A custom alloy tank and matching seat to fit would get you what you want.
I always liked the KMS tank. Carbon I believe but probably only holds a gallon. I don't think they are doing these anymore and wouldn't fit the SD anyway, but the shape and style of the bike is what I was hoping that KTM would do with the Supermoto. If they had, I would have bought one instead of my SD.
Will