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Maybe a yearly thing to check.
I considered that and if I have to go that route, I think I would try just two flats to start with.It might be a massive pain in the ass, but you could grind a hex into the top of the aluminum and hold it with an open-end wrench.
That's probably the best idea.You'd just need two flats. Since the threads go all the way thru the mount, you could also use a longer bolt with a pinch nut on top. That might alleviate your having to retighten them every year.