No saving that, so I bought an aftermarket rim that is 99% the same. After rebuilding the hub, I laced it into the new rim.
Here's a vid I took of that process - a good excuse to test out the time lapse app on my new phone!
Should have it back on it's wheels in the coming days. Then its just a matter of the rear caliper, front master cylinder and the decals. Then, I can finally get stuck into my Mini race car project again!