I’d think he should be able to use a switcher/KVM that gives him at least the same picture quality as with going direct with VGA. This led me to believe he must have a crappy quality switcher.
I can’t perceive any loss in picture quality going through my KVM switch with VGA vs direct. It’s the only thing I’ve ever known, and clear to me. I have no reason to stop using it, but the OP is obviously having issues with his.
Wow, looks complicated, but gives a lot of flexibility for him.