Question on automation of reminders ...

I have a flow that sends survey invitations via the send survey core action, and that works great (I load that up via campaign members, and it does its thing well).

I am thinking about how I might best handle reminders to people who have not completed their survey.  Ideally the email containing the survey link should have some different reminder text ("hey we sent you this, please fill it out" or such), however the core action uses only the default email template attached to the Survey at time of publish.

If I duplicate the Survey and use that duplicate for reminders, then I have split the response/completion metrics across two different Surveys, so that's not ideal either.

Has anyone had a similar situation and solved the problem?  I was thinking maybe to use the survey completion as a source for a 2nd Reminder Campaign, but haven't quite worked out how to send them back their original invite link with a different email text that is more "reminder" friendly.  Perhaps capture the survey link and create the mail message dynamically for each recipient in a Flow?  The recipient count will be small (< 200 people for sure).

Any thoughts are appreciated!