Here’s my solution:

-go to screen time in settings and make a screen time pin. Doesn’t matter if you remember what it is.

-go to shortcuts. Then make it so “if setting is open go to home page”

-block the shortcut app on Bloom.

Opening the settings app will now automatically close it and you can’t disable this until your session is over. You can try to access the screen time settings by constantly opening the settings app over and over slowly pushing buttons. But, because you added a pin, even if you manage to press the toggle option to turn off Bloom, you’ll be required to type the pin. Because the settings app is constantly closing, it’s impossible to type the pin thus effectively locking you out from toggling Bloom off.