I have a theory that I will put in practice in my new patch (I finally gave up on PSP
)
You can normalize the Equip change skill set using ASMs and the trough the patcher change the Action Menu to "Item" and add the abilities, rename it on TacText, and add to all classes in mind innate "Equip Change" and see what happens.
Might work, let me know since I copying everything I made for PSP to PSX at the moment and I'm unable to verify it.
Good Luck

You can normalize the Equip change skill set using ASMs and the trough the patcher change the Action Menu to "Item" and add the abilities, rename it on TacText, and add to all classes in mind innate "Equip Change" and see what happens.
Might work, let me know since I copying everything I made for PSP to PSX at the moment and I'm unable to verify it.
Good Luck