Thank you for your help. I apologize if I caused any confusion or have been unclear.
To clarify, I want my mod to be as vanilla as possible. Since I'm not very familiar with RPG Maker MV, this way I won't have to make many changes when the developers update the game. Or have problems with compatibility when used with other mods. Using your mod would be my last resort. If all else fails, I'm hoping I can use your mod.
I've edited the code in the 'YEP_EquipCore.js' file as you suggested, but it seems like it's still not working. The issue persists. Could you possibly assist me further? I hope I'm not bothering you too much.