If you are after centre you can swap with ease, and to keep the 4 stud datsun pattern you could consider using the skyline axels and tubes into the hilux centre, thus creating a disk brake hilux diff. The hilux share the same spline axels although im lead to believe some have a 31 spline as opposed to a 28, but cant say for sure.

You could grab any hilux housing fairly cheaply. It may be slightly more involved than either a straight hilux or skyline set up but will be a better result in the end with the right stud pattern, disk brakes, and a centre you can swap as you please.