The regulation, via the commentary, does not require that all disclosures be on the same piece of paper. See subparagraph vi:
(a) Form.
1. Design requirements. Disclosures must be presented in a format that allows consumers to readily understand the terms of their account. Institutions are not required to use a particular type size or typeface, nor are institutions required to state any term more conspicuously than any other term. Disclosures may be made:
i. In any order.
ii. In combination with other disclosures or account terms.
iii. In combination with disclosures for other types of accounts, as long as it is clear to consumers which disclosures apply to their account.
iv. On more than one page and on the front and reverse sides.
v. By using inserts to a document or filling in blanks.
vi. On more than one document, as long as the documents are provided at the same time.
Nevertheless, without more information, this does not seem like a good idea. At a minimum, make certain the vendor disclosure and the one you are supplying are not in conflict with one another.
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In this world you must be oh so smart or oh so pleasant. Well, for years I was smart. I recommend pleasant.