HiRnFernandez,
Following is the way, it can be implemented:
1. Make a custom object for email templates like following:
and another for email request:
Then, a query in the process can get the data to be sent in the email. The email will be filled using the sub object of email request object. The sample xml can be as following:
This approach is really generic and can be used for any type of emails to be sent. Whether the email needs to be sent once, on status changes, on update or as part of the reminders.