Not really… just a slightly higher end of gear, most of dells professional series will do it from memory, the gigabyte on my desk does it.

Yeah… tend to agree - it’s doable but OP would be reaching for some fairly hectic gear to solve a pretty small problem. Consumer monitors with PIP definitely exist and would be cheaper.

If all you’re looking to do is nicer input switching, a KVM switch would be a better solve.

Capture cards would be more useful if you wanted to record the gaming sessions. AFAIK they will always introduce latency as they are usually designed for a situation where that is fine.

I’ve been running ITX gaming builds for years, they work great and I don’t use expansion ports anyways.

My advice would be choose the case you want first. Bigger ITX cases will take standard components easily (with some limits on GPU length), but if you want Very Small and Mighty (e.g. DanCase, Fractal Design Terra), component choice becomes very important. You’ll need to consider cpu, gpu, and cooling clearances.

It’s like PC building on moderately hard mode, it’s a little more difficult but the results are worth it!