You have 2 #1 mapped keys.
MK1 - sends 1 to "all"
MK1a - sends 1 to "all not 2" and crtl+1 to "2"

MKMO is 2 step. Press or Released
L virtualise #1 to use MK1a
L virtualise #1 to use MK1

on your click bar, you set the Mouseover action to be MKMO