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It's absolutely possible! This is merely a form of the Referral Form pattern -- where Referrer A can fill out a form on behalf of Referral B, and Referral B runs through the resultant Filled Out Form trigger and related workflows.
In your case, you would pass the email address of the referral in the query string, then use that to populate the Email field on the form.
Sanford Whiteman - thanks for the reply and for giving me the vocabulary to tackle this challenge. I'll dig in to the referral form pattern and post back here if I can share anything of benefit for the community.