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Fun project! Simplest version: the gaming PC just plays, and its video goes to the 2nd PC through a capture card, or over NDI or OBS Teleport on wired ethernet if you don't have one. Sending game audio along the same path keeps sync easy.

Yup! I am currently using OBS teleport to send the feed from my Gaming PC to my Streaming PC. Audio is done through Voicemeeter VBAN since I still want to split my audio as opposed to sending it all under one feed. I'm also using Moonlight-Apollo to monitor the Streaming PC.

Nice, that's a clean setup. Splitting audio over VBAN gives you way more control. If you ever notice lip sync drift between the Teleport video and the VBAN audio, a small Sync Offset on the audio source in OBS's Advanced Audio Properties fixes it fast.