You still need to lay out the $ for thread repair either way. + 1 to bar ends. Best mirrors I ever used. You'll love them. Get some black caps for the holes. You can see incredible with bar ends.
Steve
+1 on the bar end mirrors and there is a wide variety of sizes so he isnt limited to the tiny ones that restrict viability. OR he can go the the type that have a stem that goes completely through the hole and nut up against washers ala H-D style