Product enhancement request: Feedback from Status Page users

We're looking for the best way to receive users' feedback (such as NPS or CSat) about their experience with Status Page. There are two main target audiences:

1. active subscribers (we may place a code with a survey script inside the footer on the website itself, for example)
2. unsubscribed users (possibly, send an email as a follow up asking users about the reason they unsubscribed, or, ask this question on the pop-up message before they click "confirm")

In order to receive feedback from unsubscribed users (the goal is to find out why do they leave and stop using Status Page), we'd need a way to include a survey option in the email that unsubscribed users receive when their subscription is removed (unsubscribe confirmation email notification). Is there a chance to implement something like that? Or maybe there is a better option available? Please advise.