Sorry about the downvotes. I’ve found Lemmy to be weirdly territorial like reddit, despite having only a few 10k users. There’s not enough content to push everything into hyper specific silos. I feel you. Also, thanks. I had some weird permissions issue on my Ubuntu gaming rig with Firefox snap and installing the .deb resolved my issue. Ignore the haters-- I found this post useful.
You can install Plex on your mobile device and toggle the “share media from this device” setting. Otherwise, a steam deck would have everything an RPI has plus a GPU and a touch screen. Since there are two radios (2 and 5Ghz) on the device, you should be able to set it up as a bridge device, but I’ve not tried this personally.