Unfortunately it requires that I turn the GPU on my 2011 17" MacBook Pro off, as outlined in the notes. That machine is my music-and-movie centre in the living room, so not a good idea.
I require for various reasons that the OS on the desktop and laptop be the same, so that also destroys the idea I'm afraid.
Thank you for the suggestion Brother R.
NP. I totally get it.
FYI….I was able to find a newer Air on FB marketplace for $150. Cheaper options beyond a new Mac are out there. 👍