An aside - a peep sight does not generate a "need" for a different front sight. A gun's line-of-sight for a given distance is determined by its trajectory with a given pellet, and the height of the front sight above the bore. Any rear sight is just a device to help your eye "find" the LOS. (An old-timer's trick when mounting a peep is to align it with the open rear before it's removed, that gets you 90% of the way toward being dialed in.)
Now what front sight size or shape you prefer is a separate issue of course.
Most find the "high" version of the Williams sights - either the FP-AG or 5D-AG - is best for barrel cockers, but your mileage may vary. I have three old HW's with AG's sighted-in for 10 meter target shooting, and they are adjusted so low that the FP-GR or 5D-GR probably would have worked.
View attachment 290592