Not that I know of, but I would like to have the same thing in my setup...
It would have to be an adjustable base plate (I guess it could be solid, but you would have to have the exact thickness for it to work), for either spotter or binos, depending on which one sat lower on the tripod? In your case you would need a thicker base plate for your binos, if I'm understanding you correctly? If you figured out the exact measurement, you could have one CNC, but that might get a little $$$!
Anyway...
I will be watching this thread to see what you come up with, thanks!