Good to know. When I used longer bolts, I reused the stock sealing washers.

These are slightly out of order, sorry.

Drag Bike Mike, thank you for all your research and pictures.  I am here to tell you that repair you outlined for the right rear head cover bolt works perfectly!

I did pull the head with the engine in the frame, but honestly if I had to do it over, I wouldn’t.  I think there are a number of ways to keep shavings out of the oil passages.  Also, the hole in the head gasket is large enough I don’t think the drill could nick it and get steel shavings into the mix.  And, if I ever buy another of these bikes I would probably drill out both of the right-side bolts during a head cover job just to save having to do it later.

The faucet-facing tool worked just fine after modifying it as you suggested.  I used it a little differently since I am lazy.  The spring maintains tension, the rags and duct tape keep shavings where they belong.  Turn the jam nut on the bottom to tighten, and the cutter’s teeth are then going the right direction.  If anyone out there wants to borrow it let me know.  

The finished product.  The engine is so oil tight I can’t get over it.  Much better than it has ever been over the last 4 years.

Thanks to everyone on the forum who contributed to this topic!