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turned it out of a nice hard plastic like PVC
Acetal is probably the right material if you decide to go plastic, and it's cheaply and easily available, e.g. http://www.bearingboys.co.uk/Acetal_Rod_22mm_dia_x_1000mm__Black_-37112-p
gbj_tester
making a set rad cutting tool is pretty easy. assumng the part you're turning is ally?... It's not like your tool needs to be made out of tungsten or something hardcore like that! Does the part even need to be ally?
If you turned it out of a nice hard (or actually soft, but hard enough for your needs) plastic like PVC you could put the rad on by hand pretty easily, and just paint it in whatever colour you want....