So . . . I will continue along until my "old rust bucket" gives up the ghost or it can no longer handle the latest OSX updates - whichever comes first. (hehehe)
The odds are no longer being able to handle the latest updates will get you long before the "old rust bucket" gives up the ghost. MacOS support typically only goes back four years or five at most.
By the way, an iPad Pro would do everything you described, less costly, and is arguably easier and less complex to manage.
