USB -> Anything requires adapters/drivers/dedicated hardware. Composite is a dead format so you’ll be hard pressed to find one, let alone find one which works. VGA is a least a video standard supported by almost all video chips (why I recommended it).
The only PC made in this century which supports composite natively, is the Raspberry Pi.
No I replied on an app. I think there’s a bug which doubles post reply’s.
Steam Remoteplay together and RetroArch are the only other option which I found usable and works with Duckstation (swanstation) and PCSX2. I remember on Windows there was a way to high jack the executable to play more than what steams offers and it worked, but that was back in 2022.
Otherwise yeah parsec is probably the only other option.
Ah found my video where I documented it back in 2022: https://youtu.be/P3J23OlNMXE