I don't think any custom wheel makers would take on the liability of manufacturing any kind of split ring rim these days. All it would take is for one person to get maimed or killed and they would sure enough be out of business.
If anyone would have some originals, it would be Jack down in Tucson. However, these rims are ten lug, and the ones for this deuce are six lug right? So it won't be a bolt on anyway. You could probably make adapters, but I'm sure you'd have to modify the rims. It might be worth checking to see if you could make some Goat rims fit, even though they are smaller and you'd have to figure out tires all over again. Nevermind, just forget that last part. It was dumb.