I have a workaround using the UIMask in Reshade that works in VR without affecting what you see in the HMD. It’s based on the same concept explained in the video below in the youtube tutorial, he is using this to brighten his MFDs, but you can use the same general concept to block out certain parts of the MFD spaces that you don't want to see. You just need to ensure that the mask is built to encapsulate only the areas of those MFDs or screen, that you want to block out.
Hopefully, that makes sense. Feel free to reach out if you need further instructions!
I’ve also included an example of my UIMask. The black areas are the only parts that get manipulated by Reshade. It’s important when you install Reshade that you don't install any of the VR options—just use the DirectX options and don’t select OpenXR.
Watch the tutorial below and this will explain the general concept, you just need to make the right type of Mask for you setup and the rest is just using the settings explained in the tutorial to turn parts of the created mask solid black, so it blocks the game from those MFD's