I think the public service gives you a model for that. It's not a perfect model: improvements can still be made to it.
In another connection, I know that specialized French second-language courses are provided for judges or potential judges who have already achieved a certain level of French. I know that one specialized school in Quebec City offers an intensive specialized course for judges wishing to develop their French. For these institutions, we're not starting from scratch.
If we have a qualification, classification and examination system, there have to be training institutions. We can't suddenly decree that those who didn't plan for that in their youth are excluded from the process or have no opportunity to become judges.