Oh hey, this worked fairly well. I used one of the Snap fake-greenscreen filters and fed it to OBS as you suggested. It really does highlight the limitations of fake-chromakey (edges are fuzzy/flickery) but that's to be expected without a real, properly lit backdrop.
I won't be using this in any work meetings but it could be fun for calls with friends.
I won't be using this in any work meetings but it could be fun for calls with friends.