I don't think that is practical. I have seen enough elections to tell you that it is unrealistic to say that the Chief Electoral Officer or whoever is responsible for an election in a riding or municipality will be able to find enough staff within the required timeframe. I believe it is entirely natural to have a pool of individuals put forward by the candidates or the parties, and this facilitates the process.
Should those appointments be made earlier? Yes, that would facilitate the process. However, there is a difference between saying “I want to have it a little earlier” and saying “it's not you”.