Just tried to mod the Vegas'soft power play table using a given registry on Hellae's Vega post I think. Unfortunately it didn't work: Windows boots but the display is completely garbled and ends up re-booting.
Now I'm stuck in that loop. I'd love to be able to force a boot into safe mode and run DDU but looks like Windows 10 is not allowing that anymore. If you have any ideas (short of me having to reinstall Windows alltogether), fire away.
Windows re-install isn't the end of the world.
You could try booting with another gpu or igpu and then delete the table out of your registry
May try flipping the bios switch on the card and see if somehow that gets you around it.