The OP posted several months ago and presumably has fixed the issue, but just in case, FWIW:
No, there is no plate nut or spar or anything, even a wood block on the back side of the interior skins in which to set the screw; its just that one sheet of Aluminum.
So, you could dab the threads with some loc-tite before screwing them back in to help mitigate them shaking back out, or secure them with pop rivets if you have enough room to get a rivet tool back in there -- that would be a more "permanent" solution. if you ever want to pull them out, you would have to drill them out.
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