See the "Hate Your Windows Key, Mod It" mod for how to punch those metal labels out from the back. That's the safest way although you may want to make two holes for the larger label.
Thanks Ripster, I'll try this approach.
I'd like a spare silver ibm label.
Your best bet is to stalk terminal boards on Ebay. You'll get a full set of keys & springs as a bonus. I paid $5 for a practically unused terminal board. It doesn't have LEDs, otherwise I would just plan on converting it.