You can have more than one admin account. Anytime you want to switch the logged in account, you need to log out from the community on all open tabs and log in with the new one. This is the same standard behavior on other social platforms like Fb.
Alternatively, if you want to easily use the interface of different accounts when you are posting something or liking posts, you can add a few "bot account".
This way, when you log in on behalf of any admin account, you can use a different bot account's interface (profile) to share something, leave comments, reply, and like. You can learn more here21.