Personally I would rarther refactor win conditions entirely than keep adding to this flawed system:

• Give "Play Credits" (RG_TRIFORCE?), GCBK and with this PR Ganons soul thier own randomiser checks
• Setting for win condition between Triforce Pieces and beat Ganon, and when you meet the condition you get the "Play Credits" item
• • if Ganon is not the wincon and is beaten, any relevent flags should be reset and Link should be placed outside Ganon's boss door for the time being.
• Instead of LACS, GCBK is given from the special check when the condition is met, regardless of where the player is
• Ganon's soul would be separate from the other boss soul and GCBK, and have it's own settings and check
• To cover the current Triforce Hunt implementation, it should be possible to set "Triforce Pieces" as a condition for GCBK and ganon's soul.

I think this would be more upfront work, but would be a much better baseline to work from than to add to something we want to change later anyway.