Since I’m working on an update anyway, I went ahead and added that as a new option. Not ready to release yet, as I may still need to do more updates to work with the updated Groups extension I’m working on.
Customizer won’t help you with what you need, it will allow you the change the header, but won’t remove it (only customizes the fixed text strings, can’t customize variable field values that the user has filled out on sign-up forms).
If you send me a private email through the contact form, I can send you the updated version of the main plugin, which has that option to do what you want. I’m just not ready to release it to the public yet, but it will work for what you need.