Final Fantasy Hacktics

As I actually like the idea of an item giving access to skills, I wondered if it was possible to:
1.1) change the Materia Blade so it equips in the accessory slot
1.2.1) change the item checked from materia blade to some accessory
1.2.2) change it so that multiple items are checked, items not limited to weapons.

If anyone knows, and how, it would be much appriciated.

if I understand your questions correctly the part I circled should answer everything

Can't believe I missed that. However, questions 1.2 still stand! But thanks a lot for slapping me to my senses.

I think you just have to check the accessory box and then change the item's sprite and text edit its description

I don't know about 1.2.2

Question 3 confuses me as well. What was it that you intended on asking about "change it so that multiple items are checked, items not limited to weapons"?

I assume the check works by checking if a certain itemID is equiped. I wonder if it's possible to change this ID, and if you can add more items to the checklist, so you could also use another sword to get the same Materia Blade effect, or something else. Just equip sword is not enough for me :>

That would require ASM hacking because the code currently looks for just one specific item.
I don't think it would be too difficult to change it to check for a specific weapon type instead.
However if what you're asking is for it to look for multiple specific items, that would be a little more difficult as it would require expanding the code.