There’s a pretty good chance that you can get a bit of wire or a fine pick and push the key through from the other side, I’d be trying that first.

Aside from that the next easiest solution is likely to just disassemble the lock and replace the cylinder as others have suggested.

Yes, you can. I guess I should have been more specific because I was thinking of a complete kit when I wrote that (so including helmet, boots, gloves, etc) and you do need to set your sights a bit lower to make the budget work for that.

A mid range set of motorbike gear (dirt or road) or a very cheap registrable motorbike.

Alternatively a number of interesting secondhand cameras/lenses, the number ranging from one to many depending on what exactly. I’ll admit I have actually spent near that much on two backs for my 1960s era Hasselblad so you don’t even necessarily get a whole camera…