The cheapest, 2-bay network-accessible drive enclosures go for about $CA 250 and that's without the actual disks! I cannot justify paying over $CA 500 for this solution. So, I dug through the closet and located a really old Android TV box.
I should be able to plug my existing 5TB mobile drive into the device. I won't even bother with video output from the box as I'll just need the movie files' network locations to play them. I may even be able to plug this box/disc combo into the extra ethernet port on the bedroom mesh router. Yay, something new to try.