Cutecity [he/him]

Roku is fine I guess. You can install jellyfin, moonlight, playlet and web video caster. Music I’ll just stream songs from playlet, but I assume you can use jellyfin and WVC for local phone stuff

Yeah it probably becomes WiFi Direct once both find the other. In my experience though the quality is pretty bad, might depend on the devices

Using screen mirroring or does it still access the home network?

Try looking for open matte also. Some open matte versions will have recording equipment visible in some scenes though which might take you out of the movie if you’ve never seen it before https://blog.sporv.com/open-matte-master-list/

House flies start producing potent methamphetamine in their wings, which means the whole world has uncontrollable access to it.