Bambuddy and tailscale was my solution to losing access to mobile app once I went lan-only. Has video stream ,monitoring and control. Plus home assistant integration via MQTT. Only thing I’m missing is the ‘AI’ spaghetti monitoring. But those are rare for me.

There's also the Openbu or LanBu android apps if you just want a basic app for monitoring from your phone like Bambu Handy did. Although if you want to access your printer from a remote network you'll still need tailscale or similar.