Request: Changing Equipment takes a turn

Hey all! I'm just trying to work on mechanical balances in my hack, but the one thing I still have unaddressed is changing Equipment in battle via the Item menu has no penalty if playing in Wait mode. I'd like it to take a turn, just tested it out in FFIV 3D and that's exactly what it does, instantly changes it but then makes you wait until the next turn to proceed. Any way to get that into my hack here? ASM code would be best so I could slot it in the right spot. 

If that does not work, is there a way I could just disable the ability to change equipment in combat completely? I'd prefer the first, but this way would also be doable.

Thanks!