I know husky still lists an SM but i think ktm dropped the smr from their lineup. There is a 450exc depending on year. Only in the six days edition. After the early 00s the smr model had very little changed from an sxf model. Suspension valving, triple clamps, slipper clutch and some trans gearing differences. Obviously the wheels and brakes.
I have been able to street title an sxf model but i was kind of lucky. I know a buddy that did the mail in route for a south dakota title. But honestly if your plan is street it would be less headache to buy and exc or fe model and convert to supermoto.