To answer the original question, my thought would be that in the strictest sense that you would hold at the fix until your ETA at FL410. According to 185c3i - you commence DESCENT at the eta. So you would descend in the holding pattern until you are able to descend using normal flight maneuvers to shoot the approach. Yes, it is totally asinine, but like I said (according to my interpretation) in the strictest sense, that's what you would have to do.

Now here is a similar question that feeds off the initial. What defines where an "approach begins" (same reg)? For instance, a small airport has an ILS and your last navaid on your route was the ABC vor, then the airport. The ABC VOR isn't itself an IAF but a feeder route (a medium line, with alt, distance and radial. not the thick transitions). Do you hold over the VOR or do you hold over the IAF?