Change a user's previously submitted form values

Hi,

I'm trying to build a rule that will fetch a user's entityform submissions and modify one of the submitted fields on the older submissions (based on a field selected in the most current submission).

Use case: I have a form that is used to create a daily email list. The form has a "remove" field. A user submits this form every day (sometimes multiple times in a day) to be added to the email list. A user can select "remove me from list". This will remove their last submission from the email list, but not their previous ones (which didn't have the remove option selected), so they still get notified.

I need to programatically modify the user's previous submissions so that they all have the remove field selected (when it gets selected on their latest submission).

Thanks