Widex Unique Passion (U-PA 220). Possible receiver upgrade M->P?

Hi all, I’ve got a couple of Widex Unique Passion RIC hearing-aids and last year I upgraded my right receiver from S to M. Now I need even more power on my right ear because my hearing loss got worse but my audiologist’s said the right receiver is at its max volume so I’d want to know if it’s possible to replace the M receiver with the P one. He’s said it’s not possible but I prefer to ask you before taking any decision.

Is there anyone that replaced a Widex Passion M receiver with a P one?