Clips for Lexan weather inserts

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.

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.