If the raspi can handle a debian linux you could run umbrel inside it. Umbrels website gives a terminal command for quick setup. That way you can torrent with linux, route through tor or vpn, and then have it go to the content folder you use (umbrel or not) while still running umbrel how you do now. It also means you can use umbrel for whats supported there and host in linux for unsupported things or better control.

I wouldnt enjoy using an RPI for managing everything due to the hardware. It may be best to have one RPI for bitcoin, another for media hosting and torrenting, another for running a virtual router, etc.