For a small family of parts, would you rather adjust one robot-loading nest or swap a dedicated insert? I'm drawn to fewer loose bits, but I don't want each change to become a measuring job. Interested in where people draw the line between adjustable and needlessly fiddly.
I'd lean towards identified inserts. More pieces to store, yes, but I can prepare the next kit without asking someone to remember an adjustment. Only a stores preference, not a verdict on your fixture.
Depends how often another size appears. I'd be reluctant to make a dedicated insert for every one-off. A drawer full of obsolete answers isn't especially flexible either.