That's what i did but didn't work, text note visibility does not respond when yes/no shared parameter created on sheet is unchecked, even trying make the text note via nested family in titleblock. So the solution was creating a label associated with a new shared parameter in titleblock, and then in project sheets, leave text blank when no note needed, but at least i can do it in several sheets at once.
I've tried with north arrow, but is not working either, i made the symbol, following tips in this forum and tutorials explaining how to do it as an instance field in each titleblock (but i thought could go a little further), imported it to the title block family, created a shared parameter angle to associate with north rotation, then in project follow as you described, and what i'm getting, in project, is each titleblock having his north angle field when selected, but correspond sheet also has, but the two are not connected, and only the one in titleblock changes the symbol angle. So, while being in a painful relation with parameters, i prefer to realize that i have to turn on/off north and copy paste the angle to each sheet.
I'm grateful anyway for your atention.