Send an email with a link to start a process model

Hi all, I'm looking for some advice. We have a potential requirement to gather an approval or rejection from a user who would not necessarily be a user of Appian. The business cannot define up-front who they would need to gather the approval from and it could be someone different every time so my initial thoughts were to send an email from an Appian process that includes one or more links to send a reply email back to Appian that would start a process model to capture the approval or rejection, the sender and date time stamp.

Has anyone tried anything similar? Is it possible to create an email in Appian with the necessary links to send a reply back to Appian? Does anyone have any alternative solutions?

Any suggestions would be gratefully appreciated.

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