User roles editor - Add, Assign and Switch user roles

Hi,
we want to offer users discounts based on their volume in the last month. if a customer made orders for more than 30.000€ he should move to Bronze status and receive 1,5% Discount. After a time span of 30 days he should move back to customer.

this is easy and already setup. The problem is, that the only option here is a lifetime measurement. so if the customer makes another purchase for 1€ he has a lifetime spent of 30.001 and moves to brones automatically. In this system everybody is gold sooner or later.

We need the calculation of spendings limited to a time span of the last 30 days.

Is this possible?