I mapped this to Shift-Alt-R...just select the output tracks, press your shortcut, and put your feet up.
Track:render selected tracks to stem tracks (and mute/bypass originals)
Item:select all items in selected tracks
Item edit:move items down one track
Track:remove selected tracks
Track:unmute all tracks
Works great for me here, I only mute tracks temporarily, if it's long-term I mute the items, so I prefer to automate the unmuting...disregard the last step if you differ, and unmute them manually.
I just tested this on some V-Drums recorded into EZ Drummer in a multi output folder, worked perfectly...but ymmv.
Try it if you're game!