... it makes more sense to me to have two key selected windows,
one with your personal view or your viewfinder aspect of the sky at where
you have the main telescope pointed, may be with an artifact given an idea
of the other selectable window and it's field of view (the actual normal
Guide one).
One key could alternate between them.

I don't know if any one as tried to run two simultaneous processes in
separated windows, directories and installations?