Combine multi-screen kantan mapper and container controls?

I have a three projector setup where I plan to route all textures through Kantan Mapper. I have Kantan Mapper set to “Bounds of All Monitors”. (I’ve read in a few places that this is the most performant strategy.)

I need to also include a simple interface with buttons that toggle between a few settings.

I seem to be asking google the wrong questions about how to share screen space during performance mode between a simple interface and Kantan Mapper.

Could someone point me in the right direction? Thank you!

Quick answer is that kantan should only be outputting on your projectors. You would make a separate panel for your interface that will be used on the laptop/desktop. Then that panel along with the kantan panels are combined into one big window that spans the desktop plus all projectors

Thank you for spelling this out for me!