How to deal with compatibility issues for a post-game questline?

[UndeadMartyr]

So I want to do a post-game, Broken steel style quest mod for Fallout New Begas.  Most of the storyline will be in a new worldspace, but I want to begin with a party in the Lucky 38 lounge and a saboteur in the basement, then one or two minibosses to track down in the Mojave before leaving.

 

The issue is I'm not sure how to 1) begin scripting a quest mod dependent on FPGE's scripts and 2) how to test both for debugging purposes.  I'm also concerned about compatibility- I'm running a fairly modded playthrough, so if I plonk someone down on the Fort for instance it is likely to have issues.