Restrict number of emails sent to each contact

We currently have a 48 hour rule where we flag each contact when we sent them an email. We use that filter as an exclusion in our campaigns to make sure they don't receive emails on consecutive days but there are ongoing campaigns that didn't have that filter.

What we wanted to do now is to add a restriction on the number of emails sent to each contact per week. Let's say 2-3 emails per week. Has anyone tried creating a program to do that on a system level rather than flagging each contact and adding a filter on each campaign canvas?