Yeah, but if you're this deep into the self hosting rabbit hole what circumstances lead to having an extra GPU laying around without an extra everything else, even if it's relartively underpowered? You'll probably be able to upgrade it later by recycling whatever is in your nice PC next time you upgrade something.
At this point most of my household is running some frankenstein of phased out parts just to justify my main build. It's a bit of a problem, actually.