I'm beginning to prefer more light either side of the front seen through the rear sight notch.

What are my options for P Series Sigs?

No need for night sights or illuminated front sights.

Looking for thinner front sight or wider rear sight in a height which puts POI on POA at 25 yards.

Ameriglo has a .115” front sight that will give you more daylight on the sides. No dot or tritium.

Dawson Precision.
You can get any width of blade or rear notch that you could ever want.