Cool. I have 2 pixels that are at EOL but could maybe do this with and teach others in my freedom cell
I turned a tired old Pixel 3 into a private, offline toolbox. No accounts. No clouds. No snitching. This is exactly what I ran, how I used it, what worked, and what issues I ran into.
https://untraceabledigitaldissident.com/old-phone-airgapped-wallet-setup
Discussion
Freedom cell? Say more
Why not put LineageOS on them?
That way they will still receive security updates!