Hi @Nomad -
While putting a PC in the boat works (you’ll need an ethernet switch) I tend to strongly discourage it - it can absolutely trash efficiency (using as much power as the BlueBoat does on cruise), and remote desktop is inherently clunky. You can reach BlueOS and drive via Cockpit or QGC via Starlink and Zerotier - more details on that here and here, feel free to ask questions in our discussion thread here.
If your concern is about losing data due to communications issues, logging the (likely proprietary?) data output of the unit may be possible - some reverse engineering could yield an extension that captures (raw) data on the Raspberry Pi running BlueOS without a crazy amount of work, especially in the age of vibe coding!
Are you thinking of setting a fixed length of tether to the towfish?