Brady, if you're fully digitizing onboarding and engagement with webinars, you should look at automating your webinars instead of doing them live through Zoom which isn't scalable.
Check out eWebinar (https://ewebinar.com/) which saves CS teams from doing the same webinar over and over again by turning videos into webinars (from lead capture, to reminders, to follow ups, etc).
All the registrants and attendee data points (and more) you're looking to send into SFDC and ChurnZero can be done through Zapier already.
Disclaimer, I'm the Cofounder and CEO. You can see how other CS teams are building their digital CS/tech touch program on this use cases page: https://ewebinar.com/saas-customer-success
Happy to help if you have questions!