I would have it work as you described:
Use the Image tag to set unique field
Generate new subject key
Match QR image and following images to that subject
What it achieves:
1. Cleaner Jobs. I typically recommend that a photographer create
"blanks" for 10-15% of the schools enrollment. In a school of
1000-2000, that's 100-250 subject records that disorganize a
2. Less Paper/Labels/Camera Cards. Photographers who utilize QR
matching print all of the "blanks", and depending on the school
district may use 1% or not have enough.
3. Proper QR matching. The "blanks" get cumbersome to track. If a
"blank" is mistakenly used from a different Job, the matching QR
will not exist in the correct Job. QR matching will just match the
"blank QR" and its following images to the last QR that does have a
match in that Job. What inevitably happens there is it is either A)
caught in poses mode selecting primary images, and then is
cumbersome to fix via 3 different modes, or B) isn't caught at all
and a photographed subject does not get service items, or even
packages depending on the efficiency of a photographer.
Does that help you see my vision? I don't want to continue to
add details if you don't quite follow.