this question comes up often enough there is a site dedicated to it: https://iselmdead.info/.
for the open minded: building in elm will change the way you see software development. like the matrix red pill blue pill scene - you won’t be the same afterwards
Theres an opportunity here for someone to build a "platform" that makes this all plug-n-play; like what the apple/google app stores have done but where the end user has control.
Something along the lines of someone buys some hardware with this platform on it and gets a gui that lets me install "apps" on top of it.
Personally, I've got a home setup that is on its way to what the op has; but I think there's demand from non-techy folks to get off the big co's apps and onto privacy focused ones that they control.