Tweakaroo has this uniqe feature that help you swap elytra with chestplate with one button. While having this 2 mods, it makes player in singleplayer (in my case) to fly without an elytra. It makes player glide like with nothing, but with a chestplate, and it make eg. not using elytra durability, but still being fully protected.

If screenshots or vids are needed - tell me to do them so