Took a whole bunch of iterative fiddling with replacement UVs and edited/added meshes, but here's the end result of my first lightmapping test with KBlender:
https://darthparametric.github.io/KOTOR_Lightmap_Rebakes/stunt_55a.html
Thanks to @seedhartha for adding that feature to KBlender. Works pretty well once you have everything dialled in.
This version is for K1CP. Now I just need to make some slight revisions to the version for my Dark Side Ending Cutscene Enhancement mod (mainly just baking shadows for the different stunt crowd).