I just hoping you weren't doing the 4bt as it would chew up that m5.
I have never heard of anyone making an adapter for the m5 so info will be hard to come by. On any of these forums, I think you posted elsewhere too.
IMHO, I would entertain using a Toyota's using the 22R style 4 or 5 speed transmission from 1979-1995. Just because the adapter already exists.
ACME ADAPTERS - Store: Engine Kits