Why not leave it installed and thus it keeps all it’s updates, etc current…and when you do go Online you are protected.
Plus, while you think “online” is the only way to get viruses it is not…eg, emails, file sharing, etc.
I think I get the “why” but think there is much less effort to just let it be there all the time than the hoops you’d have to go thru…just IMHO.