Which would need to use OpenCore (if one would read the fine print in the EnableGop documentation). Creating an OC config as described here for other Nvidia cards could help before spending time on modding a vBIOS only to get the EFI picker working.Since you are quite skilled, and no pre-cooked vBIOS for GTX1080 on page #1 yet, I think you can go ahead and cook a vBIOS for yourself.
EnableGop: Pre-OpenCore GOP support for EFI-era iMacs and Mac Pros
You wait ten years for a driver to enable pre-boot graphics on unsupported GPUs in EFI era Macs, and then two come along at once... This post is to announce a firmware driver to enable the native Apple boot picker and early macOS boot progress bar (plus other parts of the firmware UI: target...forums.macrumors.com
Last but not least one might have to modify the connector information within the vBIOS to get eDP support - this is beyond my capabilities.
Edit:
OpenCore can be used to boot Linux. Usually we start using the OCLP app which auto generate a hardware tailored config which has to be adjusted to support Maxwell/Pascal cards for macOS brightness control as described here on this particular thread.
But it may or may not solve your issue to drive the internal display. Sometimes it is the lacking EFI driver which does not enable the backlight on boot, sometimes it is additionally lacking vBIOS support to drive such a backlight. There is a special hardware solution (small PCB with cable connections to be included between power supply and display driver board) to enable and maintain the backlight on boot.
All you need you can find here - unfortunately there has never been a recipe published how to modify a Nvidia vBIOS in depth to support eDP.
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