I would suggest that your company and its captains has got it wrong as in two of my employers no one was allowed to interrupt the flight crew doing checks. Speak when you are spoken to.
And Airbus do have experience of your real world as I have a mate who works for them doing line training for their customers.
my last company changed their checklists on the 747 which resulted in them not being allowed into the USA as both Boeing and the FAA decided that it was illegal.