You are asking these customers to consent to two different types of e-delivery for documents containing required "written" disclosures (Reg. E, etc.) The demonstration used for the "pull" delivery of periodic statements sounds good. Demonstrable consent for html pages could be very simple, but however you do it, there should be no chance that the customer could accidentally sign up without understanding what's happening. Bypassable links to the up-front Reg. E, DD, CC, etc. disclosures are unacceptable. You should present the link(s) is such a way that the customer cannot proceed without visiting the pages containing the account-opening disclosures. You don't have to force customers to scroll all the way down each account-opening disclosure page before exiting the document(s), but that's a choice you could make.
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...gone fishing.