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I'd previously used AirServer for this. I don't remember bad quality but had a little lag and they got bit by some OS compatibility for a while.

https://www.airserver.com/Mac

Will try this out, thanks - I think I tried it several years ago and got annoyed that AirPlay wouldn’t do full resolution, but it’s quite possible the situation has improved!

If you only / mainly plan to use the terminal on this laptop,what about using a local terminal and ssh into the main computer? And maybe use Barrier to use the same mouse / keyboard for the two machines.

That's actually a really good idea that I hadn't thought of! Of course it would be nice to have full flexibility to display whatever I want on there, but I think this would be useful. Great suggestion, thank you!

Or controller board for mac displays?