Hello @BristolRTC ,
No, at this point the resend would require wholly cancelling. It is possible to still do what you want, but will require several manual steps:
Cancel the automated resend.
Copy the email, make whatever edits you need to - including to the subject line if so desired.
On the day you would've wanted to resend, create a segment. Set the criteria to:
Contact Activity > Were Sent > a specific email > the name of the email
AND
Did Not Open > a specific email > the name of the email you want to resend
AND
List Membership > Not On List > the specific list you didn't want to send to
Send the copied email to that segment.
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