Say Bill,
Why fill the holes with dissimilar metal screws?
Probably find some aluminum 'button head' screws that would work.
If the holes are small enough you might try some of that aluminum paste on the market.* Just don't push too much into the holes.
I, too, am very interested by what Ed means as the weak link in the vang plate connect.
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* you can use it for filling in corroded areas too in spars or fittings. While probably more cosmetic than structural it is easy to file and shape and finishes like the real stuff. Caswell 'Lab Metal' paste. {Dang, just looked it up it only comes in 24oz or something (group order?). But I know I've seen squeeze tubes somewhere: Permatex, maybe?. Good for little holes.]
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