More trial and error testing on memory areas:
I decided to test and play with the changes that come when defeating a divine beast, to see if there was a trigger specifically designed to fire at Ganon that turned on. While the search proved true, this trigger handles other things too. I will be finding the areas for the 3 other divine beasts in due time, but if you wish to add this to the save editor, I'm sure some people could utilize it.
WindBlight Ganon
C319B
1 = beaten, will not spawn before Ganon
0 = not beaten, will spawn before Ganon
Divine Beast Medoh Trigger
42D93
1 = Will fire at Ganon, quests after beating Divine Beast available, divine beast icon on loading screen.
0 = Will not fire at Ganon, quests after beating Divine Beast UNAVAILABLE, no divine beast icon on loading screen.
The Divine Beast trigger only handles those events. Any triggers involving the divine beast being on or not on the map are not included, which means if you turn this Divine Beast trigger to 0 after beating the Divine Beast, the Divine Beast will visible seemingly ready to fire, but on the map, you will see you can warp to the Divine Beast elsewhere as if the dungeon wasn't finished (The only thing remaining is the main terminal to be activated).
I have no idea what changing this trigger to 1 before doing anything involving the Divine Beast, including not subduing it, will do. If anyone wishes to test this out and post the results, it'd be appreciated!