Sendgrid User Registration Subscription

Hello SendGrid,

I was wondering if it would be possible to add a check box to the default WordPress user registration page. This could potentially subscribe the user to the email list specified in the SendGrid Widget area. While starting a new site, it would be much easier for new members to be presented this option upon registration instead of clicking on a separate page where the widget is located.

In addition, is there anyway to embed the widget in a custom way? Forgive me for not understanding the functionality behind the widget but it can be cumbersome to embed a widget into a page or post. It would nice to have an html feature with a responsive email field and submit box, similar to many forms we see in the WordPress ecosystem. I’m not sure how that would work.

Lastly, I have not found a plugin such as Optin Monster (or similar popup newsletter subscription plugins) that supports sendgrid. If you have already created the widget, would it be difficult to embed said widget into a popup?

I understand that most of this requires developer skill on my end but I was hoping to get some answers other than a link to your API.

I really appreciate the hard work you have put into this plugin thus far and look forward to more!