I can vouch for the Glock Front Sight tool, it is a little small (same size as the Glock Armorer tool). Not only does it fit the nut perfectly, it also has a "post" inside the nut driver which does two things; it is magnetized so it holds the front sight nut and the post stops the nut from going too far into the nut driver. The magnet really helps because that nut is so small and not easy to handle - you put the nut head in the tool (holding it straight-up), add some to Loctite to the threads, and then turn the tool over and fit the threads into the sight.
As usual with Glock, some thought went into making it.
Since you are going to do a lot of front sights, you might want to check out Aro-Tec as their front sight tool has a normal screwdriver handle - however, I don't know if it's magnetized or if there is something in the nut driver that prevents the nut from going too deep into the nut driver.