If you don't want to pre-board, you could probably self-assign yourself to B-0 boarding position and board right after A list finishes. You might get the usual nasty looks from some pax but probably won't get a complaint especially if you walk up looking like you belong there, right as the last A-list pax scans their pass and before they announce B list boarding.

I generally wouldn't jump the line into the middle of A-list boarding, even in company uniform. One look at the VSP package and it's clear the company probably wants A list pax more than they want me LOL