Heh. I was thinking of doing a game that was FR meets Stargate SG-1. The PCs work for a secret organization inside Cormyr which has recently come into possession of a Stargate. It was uncovered in Mulhorand, buried in the deepest level of a dungeon. The gate did not work but it was shipped back where it was united with another strange device covered in the same ancient runes.
If the world on the other side of the gate just happens to be exactly like Iron Kingdoms or whatever, its not like the characters are going to know any different.