Is there an aftermarket/alternate carburetor solution for 91 DR 250?

[john.0]

I've searched the forum and the internet but have only come up with failed TM33 attempts or unfinished testing.
Obviously the TM31 would be my first choice but they are hard to find.The BST31 would be my last choice which also seems hard to find.
Has anybody had any success installing another carburetor other than the two mentioned above?

John.