I tried this and it worked. This change required three things -
1: you have the updated Combat Groups (CG) Extension.
2: you have the invisibility option set in CG for triggering Invisibility with effects. Probably want other one in CG that preserves token invisibility between app startups.
3: you were not crazy enough to think fixes to GAL to enable CG to work with these options could be done without CG active :)

