It looks like silly fun, but as they say on their own page, they don't recommend it as a daily driver, specifically because it was designed with humor in mind, not maintainability.
Could be worth spinning up in a VM or giving away on an old laptop, though...
It looks like the bolt is perhaps brass? I'm wondering if you can't sand the surface a bit and low-temp solder a nut or something to it to get a better grip. Once you get it off, unsolder it and clean up the leftovers.
Either way, the question I would be asking myself is: is this a tool or a decoration? If it's a tool, it doesn't seem to me like it makes sense to try to preserve the bolt. I'm guessing this is old, and if so, people from long ago would have used whatever bolts and screws they had handy to repair things; you'd be keeping in that spirit by doing the same!