Hello @Dogamondo
I too am in almost the exact same position 
I did not expect to be, but here we are together! 
Did you / How did you resolve your issue of āopt-outā not working for emails sent via workflow?
Quite important for me, and most likely all, to have the option to opt-out on any emails sent out.
Can anyone with ideas to resolve please chime in, thank you all.
Best Regards
Referenced similar topics
Is it possible to add an opt-out link for emails that are sent via workflow?
https://community.suitecrm.com/t/opt-out-for-workflow-emails/
Seems youād need to do some customizations to get an unsubscribe link to work for workflow emails.
https://community.suitecrm.com/t/opt-out-link-now-working-when-used-in-email-template-in-workflow/
One solution to try would be to is to create a general email newsletter campaign to source an opt out link.
https://community.suitecrm.com/t/workflow-email-unsubscribe/