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though i've read (lately) that one should not use a maul as a wedge
I've batoned wood handled hatchets like this extensively and never broke one. That handle is either defective or Fiskars handles are flawed by design. I challenge anyone to break a sound hickory handle by batoning on the poll of a hatchet. I don't believe it can be done.

If they don't need you to send the axe in, remove the rest of the polymer from the the head and you have a splitting wedge!![]()
I really wish they would fill the hollow handles with expanding foam or something. I would think it would have to help absorb impact vibrations, as well as strengthen the handle for minimal weight gain.
The handle was probably damaged before it broke on the OP. Clearly, the picture shows evidence of handle being scraped up for whatever reason. The number one reason for handles breaking, that I have seen, is from overstrikes.