It's possible with wayland seats, if the compositor supports it. I've used sway this way. Assign M+K A to seat A and M+K B to seat B. I only wish I could change

It's possible with wayland seats, if the compositor supports it. I've used sway this way. Assign M+K A to seat A and M+K B to seat B. I only wish I could change the focused window decoration depending on the seat (say: one blue seat and one yellow seat).