I run manual equipment, I doubt it is really worth the setup cost to make the adaptor on a CNC... unless you had exact mesurements of the tapers
Pretty easy on a manual, a few tricks I will explain if/when you are ready.
Basic process;
setup female taper that fits on crank, easy to get angle if you know the tricks.
Turn female to fit stock crank, or test plug shaft, made to fit rotor, full engagement, cut a 2nd or 3rd is good idea.
When it is done and fitting to your sample crank, or stuck if it real close, remove from lathe, cut or part off.
Now mount crank (will need steady)in lathe, or test plug shaft, snout to tailstock, taper adaptor blank on. Now set up your 2nd taper, and fit to rotor you want to use.. pay attention to how far in you want rotor to sit... done..
Should take about 1 to 1.5 hrs.... if you know how to use a lathe..