How to temporarily suspend overdue charging

We are considering ways to suspend all overdue charging during the Covid-19 crisis.  How would we stop overdue charges for a time and then start them again without going back?  For example I have an item that goes past due today.  In 60 days, it is still past due.  In 90 days it is still past due, but the crisis is over and we want to start overdue charging starting 75 days after it went past due.  So we would charge interest for days 76 - 90, but not for 1 - 75.  Any ideas?

Thanks in advance