I've always wanted Hamlet and Shipwrecked to be in DST with all of it's awesome changes, but the Tropical Experience mod is not quite good enough.
Would it be possible add them as DLC?
If splitting up the player base was a problem, could you allow for the host to be the only one who has to have the dlc? Joining players would use whatever version of the game the host had.
Maybe add exclusive skins to the dlc to encourage even more sales.