Hello @NorthcottSilk ,
The only Compliant way to do this would be to specifically link to a sign up form that explicitly lets these signees know that they're signing up for another organization's mailings. Since our customers have to have either express or implied permission to send their emails, giving or selling your contacts to another company / organization is generally ill-advised. If your contacts are well-aware that you may provide their contact info to other companies / organizations, then it might be okay. The primary issue is contact consent to have their info shared to other companies.
Ultimately, I'd recommend you speak with our Account Review / Compliance team for the most specialized insight regarding this situation.
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