Anyone considered doing something extremely "hacky" like this?

Start at 4:43 for most relevant section.

I have a few powered monitors already and it'd be nice if I could have them work double duty between my audio mixing (when editing) and watching movies when I'm not working. I know Atmos is a whole can of worms intended to be a money pit, but the tinkering aspect is pretty high up there on things I like doing.