I did not receive keys with my "Project bike" and had to have the ignition key made by a smith. He came up with a key that works within the mechanism but it is "massaged" enough that it looks like hell. Don't some Fiat key blanks work in the ingnition switches?
Don't see why it could not be done for the fork locks as well. The locksmith just has to have enough "Gumption" to figure out what he has to do. You might get some looks walking into the shop with a Loop-frame slung over your shoulder.
I kind of threw out the question a couple years back on the MG list if it would be helpful for someone to start collecting copies of working MG Keys, tracking them by the lock code stamped on the key switch. If someone then lost a key or had a bike without, a duplicate key could be produced, based solely on the lock number. I haven't looked at the fork lock to see if it is coded in a similar manner.