Thank you very much for your patience
The email should be sent to each sales rep to get a list of their contacts.
About the buttons' action, it is not required for the link to add people to the opportunity, that's why I was thinking to create a fake link with a query string to record just the click in Marketo, for instance, www.ops-feedback.com?val=email addres, but I'm not sure if this will work.
I think the solution of an Outlook email attaching an Excel file, is the easiest way and the one with fewer efforts, I've played with velocity script in the past for simple tasks, but I can't say to be a developer!
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