Until one week ago I was using an old Samsung A20 with good results. I moved to a mini PC as I wanted to host Immich server and I felt it was too much for the phone (it might not be the case though...)
A quick extract from an old post of mine on what I was running: https://lemmy.world/comment/354199
Software: Termux (android app) SSH (OpenSSH in Termux) Rclone (in Termux) Sonarr, Radarr, Lidarr, Prowlarr (in proot-distro) Transmission (in proot-distro) Kavitha (in proot-distro) Podgrab (in proot-distro) Ombi (in proot-distro) ntfy (in proot-distro) Filebrowser (in proot-distro) Vaultwarden (in proot-distro) Homer with lighttpd (in proot-distro)
TLDR: Go for it! Use Termux with proot-distro to avoid headaches
Unfortunately I didn't give it a try.
I tried HA Bluetooth presence detector on my PC some time ago with not so good results and since that time I didn't gave another go.
I saw a Termux-bluetooth package so it could be a feasible thing.