Eons ago, on a once popular site called MacHeist, I got a license of Bartender[1]. Been upgrading it since and is of the best purchases I made so far. I have just the clock[2] and the un-hidable Notification Center Icon. This is my menubar[3].

1. https://www.macbartender.com/

2. https://www.seense.com/the_clock/

3. https://www.dropbox.com/s/5lu9u25lexjinzb/Screenshot%202018-...