When I had D2H, and Nikon Capture then employed de-fisheye function, I tried AF Fisheye 10.5/2.8. The de-fished image was just marred by tons of CA and smearing peripherals (not just the corners).
Of course, the 4MP is not up to any stretching, but, considering the amount of necessary correction for the de-fishing, A fisheye lens would not be a feasible alternative to a super-wideangle.