Not sure I've got you. Please correct me if any.
If you mean sending alerts out to users (informing them), then yes. You can do it using fake email as you already mentioned. What you have to do is to add fake user to group and set up your group escalation policy in the following way. In the below example real user will be notified only in 15 minutes after receiving this alert by AC
In case you mean generating alerts on Alert Central side in general after some period of time & taken into account some parameters of email, then no. Alerts are generated on AC side at once email comes.
Have I answered your question?
Btw, your ideas on AC you can report here Alert Central Feature Requests