As Stephen says, you may be just as well to stick with the stock PGMII - III. The timing is pretty good once derestricted, plus you get to keep all the little useful features such as side stand switch, neutral light etc.
Having said that, if you're up for it then anything's possible.
Never done the mod but I'd suggest:
You'd need a pair of CDI's, then modify the flywheel for just one lobe (same timing as CR), but keep the two stock pickups. You'd obviously need to check timing with a light and start off at stock NSR timing, or close to it. Then have a fiddle. Timing could be changed with offset woodruff keys.
Do it and let us all know how it goes.