Thankfully, Lantean ships rarely use ZPMs anyways so you don't need to explain how one isn't present.

The most important thing for any scenario is character interaction and story hooks.  The Lantean or Lanteans, if plural, would likely be aloof, condescending and general assholes.  That's not to say it's a bad thing.  A character arc involving becoming humbled can be quite fascinating.

My suggestion of a Traveler, SGC, or some other race makes for more co-operation.  Let me sell you on the Travelers with some spinning.  I like the Travelers in particular because they are already a space faring group that could feature people from a dozen different worlds, possible aliens and whatever else you want from across the Andromeda galaxy.   If you want, you can even throw in one of Michael's hybrids or one of Todd's wraiths that no longer need to feed, or better yet, feed only when they absolutely need to (or to save a friend's life).  Maybe this one has an alternate universe Shepard on board who desperately wants to get home to his Atlantis.  Maybe there's a rogue Vanir that helps them with engineering aboard complete with power suit!

Maybe there's a couple Jumpers, a few darts and maybe even a couple of old salvaged junkers belonging to long dead civilizations in the three docking bays.