I don't think "attendance at an assessment centre" is the right measure. That's process-driven box-ticking.
What is needed is a proper assessment, based on what the person is actually bringing to the job. You could propose bringing in the greatest ever Scandinavian superhead (or, in a RL example, the former head of Westminster) and have that overturned because of lack of the right attendance.
This change doesn't represent the abandoning of all checks. Just refraining from the enshrining of one course above all others.