Clips for Lexan weather inserts

A home owner from Massachusetts says:
We use giant Lexan panels to winterize our screen porch.

They're mounted on wood frames, which we have always screwed into the trim.
This year, to make the project more manageable, we'd like to remove the frames, cut the Lexan, and set the smaller squares into the recesses shown in these photos.

We're near the seashore, so it gets pretty windy here. Do you have clips that can hold the Lexan in place? We'd be screwing into aluminum frames.
User submitted photos of window hardware.
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Paul from SWISCO responded:
Hmm... I'm not sure what could work. I have a few questions: are you leaving the screens in? Are you putting the Lexan against the screens? If you are, it looks like a 1/2" recess. How thick is the Lexan?
A quick learner from ma. says:
We are just putting them in for the winter and the Lexan is 1/4 in thick and is going to be put right against the screen. I wanted something that can be turned somehow so the clips would stay permanently when we took out the panels.
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Paul from SWISCO responded:
Thanks for clarifying. Seeing as how this is a wood frame, I would consider our 62-022 rivnut with the 70-205 1/4" offset clip, as well as our 33-083 stainless steel screw.
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