"dsbrant: so my shifter should "think" that the middle chainring is the outer ring, and the granny gear is the middle ring? Do I understand this correctly? So that if I forget and move the shifter to 1st position, what happens = nothing."


Exactly. Just set your shifter to "2" instead of "1" and then set up your front derailleur normally. This procedure is a good one: Front Derailleur Adjustment | Park Tool Then, when you accidentally shift into "1" the wire will slacken but the FD will sit against the low stop.