Yep, I have personally seen that exact model get broken driving a wedge. It was a splitting wedge, but now it doesn't have a handle. I guess a plastic wedge would be more forgiving, but it break quite easily.
Brad if this is strictly for driving wedges, go to the hardware store and buy a 3.5 axe with a wooden handle (cheaper the better) and cut the handle off to make it more comfortable to carry and swing. A hatchet is nice, but not so great for driving wedges. Most 3.5# axes have a 28-32" handle, cut that back to 20-24" and you have a solid wedge axe.
A 2.5# axe head might be better but they aren't as easy to find.
You are over thinking this.