I'm not sure if it if it would save you any, but what about cutting the parts from bar stock in the vise and interpolating all the features. You maybe be able to get several parts programmed together on one strip of material. Then make some fixture of soft jaws to flip them over and clean off the back side/waste stock. I have some round parts that are 1.25" OD that I plan to do this with. Set-up and programming is easier (for me) compared to putting the stock i a spindle chuck.
I guess it would depend on how round you need your diameters to be. For me its not too critical so this should work out.
I feel like this side of the forums is a little less DIY, but for less than the price of the Rapid Turn you could convert your G0602 to a CNC lathe...