Thanks for the compliment, but I stink at electronics! It baffles me.
For some unexplainable reason, I do have "skill" at soldering. But I
have no idea what I'm wiring up. I need to be told, "do this do
that".


You could build a switchbox like this yourself, and if you remember to only
switch inputs to left or right, not both, getting center stuff by panning,
you could get very nice results, and use up a wad of solder. Of course, then
your results will depend on the quality of your D/A converters.

Peace,
Paul