I plan on using a starter on the spinner. Using the starter adapter would, as you pointed out, require another hole in the cowl. I forgot to mention that I actually have another hole in the cowl for the needle adjustment.
Using the adapter from behind the prop is certainly safer. If you do go this route, the one drawback with using a drill is if the engine kicks back, the drive cap screw can unscrew. If you did use a drill, I would think that you could cut a driver from a standard alan. The adapter that you get from RCV is designed to fit the shaft of a starter. Also, when starting from the crank, you have to reverse the rotation because of the gearing. With a starter, you just connect your starter with the red clip to the black terminal on your battery and the black clip to the red terminal.
I think we are also blazing a trail in the area of fan assisted cooling too. (perhaps blazing isn't the word to use to describe cooling!)

Scott