Crossing Streams

Expedition to the Barrier Peaks is a longtime favorite module of mine, serving as it did as a halfway point between D&D and Gamma World.  I remember hearing about it when I was younger, and reacting much as though someone had handed me a peanut butter and guacamole sandwich.  I like scifi, and I like fantasy, but both, together? 

The more I think about it, though, how much of a problem would it be, really, to incorporate either into the other?  In reality, the fantasy folks would probably marvel at the artifacts the scifi folks had, and the scifi folks would wonder how much radiation the mages had to bathe in to get so many mutations!

Bill Slavicsek didn't include it in the Dungeon Survival Guide because he felt it was a "fundamentally different experience", but I think that was the "peanut butter and guacamole" reaction.  I suspect the real reason was a branding decision, but that's another conversation for another time. 

Long story short, even though the direction always seems to be to bring the sci-fi to the fantasy, how would a group of irradiated, post-apocalyptic folks handle being presented with a bunch of sword-swinging, magic-casting do gooders?