My thoughts exactly!
I bought some "Penzoil" plastic wrenches from the local Checker for about $15 for the pair. They work great. Yes the oem pulley should only be torqued to 20 NM, and the larger of the 2 pictued should work just fine.

Ive used it several times with zero issues and wouldnt think about using any type of impact on the hollow supercharger pulley bolt, even if it is only to remove it. Why is the bolt hollow? I would have to imagine because of the high speed of the pulley, the stress load is on the surface of the bolt (larger bolt) vs the bolt being solid. Over torqing this bolt will cause it to break vs strip the hell out of the SC? Thats the only thing I can think of.

If you notice the large washer on the front of the pulley and the stock bolt, they should ahve a white marking on both. If you place this washer back on in the exact location it was on prior to removal, finger tighten the bolt, it should "almost" light right up, not be on the opposite side. Torquing to 20nm (practically nothing) the paint mark should line exactly up. This was verified by me with using my cheap strap wrench and snapon digital torque wrench on more than 5 different occasions.

Your mileage may vary.