I don't really want this to be a thing, honestly. I like to think that I'm pretty experienced in both being a Captain and Head of Personnel and there are rarely times besides either super chaotic events or sometimes Mercenary where things get so out of control that nothing can be done.
During normal extended shifts or quieter rounds, I feel that if there is a Captain/Head of Personnel, there isn't really a need for an assistant. I personally don't like having assistants and don't have them when I'm in Command. I get it, people like having an assistant which is totally fine as they can promote someone who isn't doing anything to help them. I just feel that if we had that role I would purposely be avoiding Command roles that deal with them just due to my general disliking to having them.
Basically, no to secretary, people who want one can promote an assistant if needed.