Rolf sounds like a great guy. A transmission swap out would be quick and less risky. For example, when my transmission cracked, the housing was put in a powder coating oven for a week before is was welded. So far it's held together.
The only thing I might add, since your bike is an '01 model, I am guessing it has the same frame as the redframe? If so, I would definitely install the transmission brace to keep it from cracking again. The mechanic that fixed my bike has fabricated a few kits with the bracket and fastener and has sold several. This attaches the bellhousing to the frame. The later model bikes have an upgraded frame that doesn't need the bracket. I am not sure about the Mandello model.
If you need the brace, here is the website.
http://www.motivcycleworks.com