First of all ...welcome to the website Tim...there are alot of great people here with alot of good boating knowledge. Have fun!
Now to answer your question. You probably can.$$$$$$..... but boy you are going to spend a bunch money doing so. I hope others chime in here but I think you will have to start from scratch on the outside and then pull the engine because of the bigger spline for a bigger coupler.
I am no expert here but Imho I would stay with the alpha or sell your boat and hunt for a b3 drive already attached to something you like.
Good luck and welcome