Thanks for the suggestion re:screen time - I have attempted this multiple times, and even got my partner to set the passcode. However I just bypass it and reset it via forgot passcode and my Apple ID password
Perhaps you could have your partner set your Apple ID password? Or you could change it to a very long string that is a pain to enter, write it down, and store it in a place where it is mildly inconvenient to access.
When they set up screen time passcode, have them enter their apple id and password. Then you will not be able to reset it with yours.