I think you have an interesting idea there, which I have wondered about myself, just don't have the application or need for it myself.
Demon 2 barrels are a little pricey but wouldn't be as high as a FI setup(I think).
You would have to be sure and changeover the load-a-matic distributor too.
I like to hear more about what you decide, just out of curiousity.
A L A N F R A K E S ~ Tulsa, OK