While not a Buell...I put a Honda VFR swingarm on my 90, Yamaha FZR1000 a few years back. Put almost 90,000 miles on it that way. Then sold the swing arm and parts to a guy in England..!
That swap wasn't that difficult.
The single sided arm on a Buell would take some work because of the tension on the belt.
If you were to swap to a chain drive, the Buell too would be just carefull measuring and make the required spacers, swing arm pivot, brake lines, etc. to fit the Buell swing arm-motor mount.
Mike
HA......NOW the above picture shows up...!
That was done very simply. Looks good.