I don't have a key holder so I was wanting something that would hurt if I attempted to remove it
My idea is easy to remove. It broke itself.
But if uou decide to aquire a genuine one you can play 2 options:
- risky: send your key by mail (actually nowadays uou would probably receive it the day after)
- lazy dare: go as far as you can and bury the key in a forest somewhere you can find it later. Far enough so you don't really want to go to get it back.
But easy to remove without hurting yourself I think plastic models are ok. If you want to remove them using wire scissors or any tools you would be careful enough.