I have on my desk an old IBM M4-1 keyboard (compact keyboard with trackpoint), a mighty mouse (the one with the track ball in it) and a mac laptop with a touchpad. I think this gives me access to nearly all the input widgets available except maybe a chorded keyboard or foot pedals. For a while I actually had 2 keyboards on my desk and sometimes I'd type all on one, all on the other, or sometimes left hand on one and right hand on the other. When I moved to WFH mostly I got rid of the second keyboard (and switched to the M4-1) because my home office isn't all that large.

I use them all at probably random ratios as the mood and task suit me.

I also use a single 30 inch 16:10 monitor.

Everyone else in my family hates this setup.