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Hmmm, Bill.. it looks as if you've been attending the Ken Hand School of Motorcycle Detailing. Maybe you could just let the grunge build up some more and plug up the leak?
Seal it with dead June bugs. <shrug> Season is coming up.
Just in case june bugs are not appropriate for his area ....http://www.halfbakery.com/idea/Bike_20Beauty_20Bugs#1399933811
It's not YOURS until you bleed on it! Hope you get it fixed...
Looks to me that it would be a sincere and monumental task to fix that from the back side. I think I'd just clean the threads with solvent and install the screw with Permatex. Nothing much to lose, and if it stops the leak, you're done.