Withholding Tax Configuration

Dear All

We are using PSFCM 9.2 with no image update and PT:8.53. Kindly review the below screenshot for an idea of how WHT is configured at our end. Also, note we have only one tax entity to which we submit tax as Withholding tax. Our WHT gots recorded at accrual stage i.e. at time of posting of AP I'm afraid I'm unaware of where it's configured else I'll share that screen.

The issue now is we would like to shift from accrual (WHT recorded at invoice level) to payment side i.e. WHT got recorded at time of payment. Any idea how to achieve this and what are the disadvantages for shifting in an already up and running environment.