You've covered two of the three common ways of
food preservation, the only one left is freezing, which is what I have seen done with 50 pound bags of green chile in New Mexico. They roast them until they can peel off the skin and pack them away in all sorts of freezer containers for pulling out later to thaw out and dump on almost everything.
I suppose a fourth way would be to put them in some alcohol and let that do the preservation. Sherry pepper sauce is common in Bermuda and is based around preserving the flavor of your favorite pepper in a decanter full of sherry.
I have an abundance of serrano peppers right now, and while the neighbors have also tired of them, the
chickens never will.