Its not a matter of can it be done..but of how much money do you have? The cases will need to be machinedmounts made, gears trated for strength, and clearances checked. NOT an easy task but if its worth it to you then yes! Contact R&D transmissions..they might be alot more help to you..or Fast By Gast. Hope it helps!
I was offered a six speed used factory gearset for the '93 1100. $2500!!! No thanks. Can you imagine the fun of trying to replace bearings/shims/gears....yadda yadda. Though the bolt in aspect was sweet.
Now if I ever hear of a 'busa motor that threw a crank, I might just have to see what the gearset will go for for that over the top project
I used to hear about the 7/11s doing it all the time (oil cooled). I also heard about a lot of blown gearboxes!!