But you’re still using Caddy as the sole reverse proxy, don’t you? Do you have multiple Caddy instances that require access to a single certificate?

I do not understand why you are using certwarden when Caddy can generate SSL certificates by itself.

Well, for image manipulation, I can only think of GIMP as I have been using it for close to 2 decades. But because I have barely scratched the surface of what you can do with it, I don’t know if it would be a suitable replacement for your use-case. Also of note, its UI is definitely not a one-to-one reproduction of Photoshop’s, so it will require some getting used to.