There is nothing in RESPA or TILA that addresses anything like this.
Once the excess funds are returned to the individual escrow accounts the accounts will have a surplus that should be refunded to the borrower according to RESPA. When you do annual escrow disclosures, as required by RESPA, the estimated payment for the next year is $0. I think you will just go through with the charade of complying with RESPA rules each year.
I hope others chime in on this topic.