1️⃣️2️⃣️3️⃣️4️⃣️. By popular demand Phosh can now automatically submit the unlock PIN, so you can skip the submit button. The length is stored in systemd-homed's user record and can be updated it via phosh-pin-tool until the GUI for PIN changing is in place. You can use the on-screen keyboard to unlock with arbitrary length should that ever get out of sync.
If you want to help with the remaining GUI bits let us know.
The initial phrog unlock after boot doesn't know about this yet so remember to hit submit there 🙃️.