For the first (Using remote url and delivery parameters)- I am able to generate email out of the public html content from S3. But its not dynamic and sends out the email with the same html content which it sent for the first time when recurring delivery ran.
For the second - Didn't find an ACS alternative since the solution is for ACS. Let me know if a ACS Solution exist.
let me know of any solution for the usecase or any more info is needed.