we don't want to see more proof, we already believe you... the question - and you know that - is how to achieve it :-)
No worries, the Truth will come out.
All of it.
Just going to make sure it is well known where the tech comes from before it gets into anyone's sticky claws.
If someone else can write an EFI to enable the cards they are welcome to. As someone said, the puzzle pieces are right there for everyone. It's not like we get an exclusive to things nobody else can see.
And I'll even give a hint that I've never let out before.
The FIRST breakthrough, the first Nvidia cards with eGPU output (when everyone at Tech Inferno was scratching their butts and kicking the "Intel Azul Framebuffer" around as a possible culprit) came when I (yeah, me) wrote an EFI eGPU rom using parts of a Mac rom from a machine with an internal Nvidia card.
EFI is far more elegant than hacking and tacking kexts.
EDIT: And here is the Air. Like nMP and 13" Non-Touchbar, this one was perfect in High Sierra