Possible to force approvals on Address page if not creating account?

I’m not sure I fully understand what you are trying to do.

Can you create a step by step process of what the flow would be?

In the GDPR Settings, in the Consents tab, the items in here will only appear on a WooCommerce site when you select the “Create an Account” button, then these consents appear.
Examples:
The woocommerce address page, with the checkbox for create and account:
https://pinpointhq.uk/public_attachments/create-account.png

Then after checking this, the consent content appears:
https://pinpointhq.uk/public_attachments/create-account-consent.png

And if you leave it blank, the error tries to display the html code instead of properly rendering it:
https://pinpointhq.uk/public_attachments/no-consent-error.png

This is using the WooCommerce templates for shopping and address entry without any sort of customization.

If you want to check out as a guest for example, you need to rely on some other form of consent, as the woocommerce built in terms and conditions consent. If that is left blank then there is no check at all and a guest user can complete an order without any consent checks.

So what I was thinking was having these consents always appear on the address page, so that there is no way to continue to purchase, unless you check them, then we could do away with the WooCommerce consent and have these instead as they are then attached to a users account and would show on an audit.

Does that make sense?

Yes.
For the next release I’m working on adding individual consent checkboxes. So you would be able to hook somewhere in the checkout process to add that in there.

I haven’t checked the woocommerce update with these new privacy things. But you could possibly hook into that to save the consent to the user meta and add to audit log.

I’ll have a look later on. I got a lot of stuff to get out before May 25th.