Could there be an option for a separate toe kick on base cabinets? And have them maybe be a separate “cabinet” like the fillers? Then when you turn the toe kick off on the cabinet it would just lay on top of the separate toe kick. Also, to have the separate toe kick construction be a full 3/4" piece on the front with the sides butting into the backside of the front piece. That way the front has a full flat surface facing out instead of having the edge of the plywood showing on the front. Does that make sense?
Just a thought/idea.
Edit: In thinking about this I could probably accomplish this by drawing base cabinets with no toe kicks and then using the filler cabinet to draw my toe kick pieces so that they will nest with the other pieces. You won’t be able to see the toe kicks on the cabinets in the cabinet view but you’ll get your pieces in there without having to manually draw them.