Well, I'm in something of a similar position with the Uncharted Seas which my introduction to Spartan Games and my favorite tabletop miniature game to play.
Something I've done in the meantime, as I believe you have, is play & promote Dystopian Wars with the hope that some DW players will expand into playing your favorite Spartan game.
Just yesterday, playing DW at our FLGS, one of the guys talked about picking up a fleet box for the Uncharted Seas, and then I piped up and announced I'll run a demo game at any time. Another player expressed interest, and I said, "If you enjoy playing DW and you like fantasy, then you'll love the Uncharted Seas."
Also, Firestorm Armada was mentioned at some point. But a DW player expressed a lack of interest in any of the FA models. But the new factions coming out definitely have me interested. I figure I should at least own one faction of FA ships before I buy a 3rd DW fleet or a 6th US fleet....
On another front, I haven't been able to find any new players to try playing Battleship Galaxies with me.... I'm planning to set it up again for the teen gaming event at the library this Saturday and see if I can get a couple of the kids that usually play RISK to try it out.