Both the 44mag and 41mag have SAAMI specs of 36,000psi while the 357mag's spec is 35,000psi so I don't see an issue there. Starting with a 357mag, you'd have to trim the cartridge guides and mod the carrier for the larger dia and longer 41mag round but both of those are do-able.good question, and great ambition. I have no clue. I'm not sure what kind of pressures the 41 vs 44 are designed for, but agree with broom-jm's take on it.
wouldnt be cheap, but would be pretty neat..... you might just watch gunbroker/etc for a while to see if such a thing could be bought outright.