Hi Andrew,
FWIW, I always use my cholce of the best calibrated sub from the first night’s session. I delete all other caibrated subs, but this reference sub, once star align is complete. Consequently, the first folder has the original subs, the registered subs, and the one alignment calibrated sub. Easy to find on subsequent alignments.
This works for me, but your approach would be easier if you prefer keeping all your calibrations.
Mark