You might as well try. Worst case you die, but Hammer Hill has a lot of traffic. I am sure a cleric will be nearby at some point soon after your death.
If you do successfully charm the foreman, you will be able to turn in the jade to get the hammer. This is because pets are always amiable to their master, regardless of what their faction currently is. But Hammer isn't useable until 50, so maybe just wait to try until then. More levels means less resistance chance.
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