Changing Balances to Calendar Year from Fiscal

We currently track balances such as PTO, Amount of cashout and donated PTO etc on a fiscal year basis where the accumulator period ends as of the last pay period in the fiscal year. We currently allow most balances in the accumulators to got back to zero at that time but in order to maintain employees PTO balances we create a split calendar on the final pay period of the fiscal year and have formula logic to move the balances for PTO into the new years accumulator.

If we wanted to maintain this same logic but move our accumulator period to a calendar year rather than fiscal year what is the best practice?