MainStage 3 Multiple MIDI Controllers to Same On-screen Keyboard

I have a Yamaha digital piano at home and a Roland digital piano at our church, using both as USB MIDI controllers to MainStage 3. When I set up my MainStage concerts at home, my Yamaha is assigned to the keyboard in my MainStage layout, but when I take my laptop to church and connect to the Roland, I have to reassign the on-screen keyboard to the Roland. When I get back home, I have to again reassign the keyboard in my MS3 layout back to the Yamaha. Is there a way to alias the Yamaha and the Roland both as, say, "Digital Piano", and assign that alias to the keyboard in my layout, so that I don't have to reassign in the studio and on stage? I can do this sort of MIDI controller aliasing in Cantabile for Windows, but since I've switched to the Mac and MS3, I can't seem to find a similar method. Thanks in advance!