How to bill customer monthly for overusing products than the Estimate quantity set for a year

We are having a business scenario where end customers need to pay a certain amount on recurring basis to consume stocks within a year as estimated. However, they should get charged on each month end, as soon as they overconsumed than the estimation limit within that year.

This is a standard Usage-based Estimate-related scenario. We have already configured the following areas like - Balance Code, Balance Profile, Entitlement Plan, Event Types, Entitlement Plan Assignment etc.

We kept the usage charge periodicity as Year in both the pricing administration and Balance profile (In BP, billing frequency automatically get set as per price periodicity for the usage charge by system), so that we can set estimated quantity for a year in the Entitlement plan. However, we set the billing frequency of the usage charge as Monthly within the Subscription Product Pricing tab.