I searched for every mod I could find in the history of ERA, listed mods used equip/unequip triggers:
Chaser (map by woodmelon)
sagamosa
The Dragon Slayer (map by woodmelon)
WoG Ultra Edition
Perhaps it's possible to make a variable for these triggers to avoid executing with certain conditions.
If that's not acceptable for implementating in ERA. I will just make it in mods
Edit: I was wrong

There were
many mods using AE triggers. And in order to use the new method of getting basic prim skills, I have to be sure every mod is compatible with the new one, not just particular scripts.