For the armor, unfortunately no, and I forgotten that underlined statement in the midst of writing my post. And the items will not fix themselves upon reloading a save, unless you changed them into something abnormal like Cuccos and/or Stone Talus monsters. The number can't go any higher than 999, though, so if you set it to 999999, it will shrink to 999 upon reload.
Edit: I'm just going to edit this so I can save space. I was able to do something that you would find easier. What I did was I took an acorn from my inventory, and dropped it on the floor. Then I changed the Acorn to Shiek's mask, here's the code: "Armor_220_Head" and it changed the acorn into the mask successfully. Then I reloaded the save and it put the mask into the armor section. So there you go, just hold ONE of 5 DIFFERENT items, drop them on the floor and change the item to any armor piece you want, thus granting you 5 armor pieces, then reload your save. Or keep going if you want to do more changes in one go, but be better safe than sorry.
@Silent Hell
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That works too lol