While I grant this is easier than some of the other options (e.g. encrypting data folder in Ubuntu Touch), I don't think this fit what I meant by "easy" (which included graphical steps, and didn't require anything separate from the phone itself during installation).

Nonetheless, I do appreciate the community forming around this. For a long time in 2020 it felt like encryption was going to be a "when we get to it" task, so it's good to see more things popping up.

Disclaimer: FWIW the closest I ever got to Arch proper was Manjaro, so I definitely didn't do an exhaustive search of every distro.