I assume you are referring to Comstar
rims?
I guess I would suggest a custom rim be cut out of aluminum block, like they do for cars. I don't know if what you are asking is possible, without introducing metal fatigue. If you can hand them a CD with the CAD program file of the finished product, nearly any machine shop could do it for you, if they will take small orders (many will only take large volume orders, but check around). I've seen some of the reality show custom motorcycle shops have custom rims cut for them.
Otherwise, look for an existing motorcycle model, with the rims you want, and see if they can be adapted to fit your bike. This should be less money than custom rims being cut. Cheers!
1979 CB750K (sold, 2012, but not forgotten)
1983 Kawasaki 440 LTD Belt Drive (sold, 2011)
1993 Kawasaki Voyager XII