as mentioned in the other thread, I'll either try to skip/replace it in the current game or give it a try in a clean BG2 installation somehow. (once I have more spare time, as I wasted already quite a bit and cheating ain't an option and I'd rather replay it again 10-20times if I get it working somehow)
The other trigger/globals are all fine and the proposal in hell was also triggered. Compared several variable checks with either your files and several comments, and all were properly set and done (including witness/Dayven after prison-break)
My guess is the original tactics version, which really messed up tons of trigger/cutscenes and SCS overhauled that version only. SInce I managed to get the Ellesime's conversation after beating Irenicus only once after like 12~ tries and only with all party member alive, but it still went into an endless-loop after Kyone awakened.