I love it
its a character trait for Xullie that he feels more normal with the prosthetics than without, because of how long he's had them. if cloned, he is basically unable to do work until his arm is replaced to its 'proper' prosthetic form. I like anything to further flesh out prosthetics.
Also as for RussianArmsDealer's anti-emp request, I had suggested something in the past, a backpack-slot capacitor to 'soak' emp. I don't have any lore or mechanics for it, but its something that could fit in with new prosthetics without making them emp immune