Update Email Batch Program after deployment

Hello,

I'm looking to make updates to a few of our field display names in Marketo. I've been able to successfully remove each of the fields from any forms/smart lists/smart campaigns/etc., but I'm running into an issue where I can't remove the field from the smart list if it's been used by a single email batch campaign after it's been deployed. Is there a resolution to updating the email program to remove the field, that isn't deleting the entire program?

Thank you!

Cathleen