I would love to see your experiment.
I have absolutely grown peppers from fresh produce after allowing the seeds to air dry. If you dehydrated your cayenne, do you have any idea how hot the temperature reached? There's a good chance that anything over 120F will have damaged the genes, but you have nothing to loose by trying.
I would also assume that you can see pepper seeds that look to be in good shape and not cracked or damaged? Those are definitely the ones I'd pull out and try, as it is the job of the seed cover to protect the important bits inside.
From my
experience, peppers need warm soil to germinate in, so I'd also look up a bit about parameters and give them the best chance you can.
Funny related story: I start my seeds in homemade paper pots (
https://permies.com/t/225570/paper-pots ). For warm-loving plants, I have a dog heat mat that I can set trays on. In February, I tried to start 8 sweet peppers, but only 4 germinated. I put the unsuccessful pots aside to dry out, and later when I wanted to start tomatoes, I put a bit of fresh soil on the top, and added tomato seeds to those unsuccessful pots. Surprise! I now have a pot with both a baby pepper plant *and* a baby tomato plant. The seedlings are an inch apart, so I'm thinking that if I choose the right spot to plant them in, I might just be able to let both live. I know the experts would tell me to cut one off at the
roots, but I'm a bit of a sucker when it comes to babies...
Welcome to permies, Frank! Check my signature for info about how we work, and how to post pictures, as we *really* like pictures of experiments!