Any way to use Gamma space with the OVRPlugin set to OpenXR?

For my application, there seems to be too much of a hit going to Linear color space.  (Unless my testing is whack.)  We have a lot of stacked transparancy, and we are simply pushing a lot of pixels.  Overall it appears to be about a  10% penalty, and in my situation, that is a very important 10%.

Any sneaky tricks to get this to work?  Is there actually something incompatible about the latest OpenXR backends, or is the check just there as a policy to push people to linear space?

I'd love to move to the latest backends and drivers if possible, but it looks like I need to stay in the Gamma world.

Thanks!