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Oh I have ready every page on that forum about 10000 times over... reg resource allocation, I'm nowhere near knowledgeable enough to work it out properly but when using rEFInd and/or apple_set_os (which does the same: trick the Macbook into thinking its still booting into macOS) my monitor remains black, I can hear it being recognised and peripherals plugged into it work, but there is no actual picture.
And yep, using Nvidia, drivers are confirmed to be in the works for Mojave (confirmed by Nvidia ) but no release date has been shared. I'm currently running a 1070 but getting tempted by a 2070, although the VR post won't connect to my 5K sadly (has been tested).
Looking at my steam library (plenty of macOS titles) I'm almost tempted to bin off windows for gaming and grab a Vega card, but that's prob unwise...
i had to double check this - rEFInd uses Apple's bootcamp drivers so I think it would be the same. But you're right, there are generally resource allocation problems on Windows using mac hardware for latest Mac machines. There's a really good guide here https://egpu.io/bootcamp-setup-guide-tb3-macbook-pro/ which recommends rEFInd over Bootcamp for more control.
Much more importantly, we've both got Nvidia eGPUs right? I can't find either web or CUDA drivers for Nvidia cards on Mojave, and the story is that Apple have dropped CUDA support in Mojave. So short of installing High Sierra I can't see a solution on the horizon...