So anybody tried to pickpocket armor from hold guards, temper it and then give it back to them? Can you make them stronger that way?

On a sidenote anybody knows how i can change my username on the forum because i kinda picked the wrong one.

They won't wear any armor. Eveb if was a theirs.

As for the second question, I believe you have to ask an Administrator for that. Although a Mod might help.

Sadly, I don't have the answer to that. I mostly customize my guard's armors in most towns through the Creation Kit. But I will give that a try.

I'm not sure if they would wear it, but I don't think it would matter because guards aren't unique, so the one you gave the armor to would despawn.