Lot's of irons on the fire for sure, keep on them and good luck! I'd see if Indy has a retrofit roots adapter for the modman.
So I can't find any good pics of one. I like that idea as I can fire up the engine on just one carb and check for issues, and then add the blower, but the bolts that hold the supercharger plate on, how big are they? They big enough to hold a full weight roots blower on there? That is a lot of weight, and its being spun by the crank and seeing all that vibration and torque....I am not sure about that option.