Sorry for the delay, it has been very busy the past couple of days. I don't really understand what you are trying to accomplish, but I don't believe what you are asking is possible.
I tried using the new AI engine for generating the flow based on what I thought you were seeking, but that did not work. It ended up creating a flow that gets all the group members, sends them an e-mail, and then deletes them from the group:

This is what I asked it to create: "Send an e-mail with options to multiple people and send a reminder if they have not responded within seven days."
The AI option is currently only available in North America. If you are in NA, maybe give it a try to see what it comes up. If you are not in NA but want me to give it a try, write out how you would describe it to an AI engine, and I will see what it generates. I have had no luck with it.