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I tried to add a golem den, but it didn't work. It's in the zaobjts.txt file, but for some unknown reason, it doesn't generate.
However, there's another option: bring back the snow hillfort and then use scripts to change it into a golem den. The hillfort has a decent value, so you can't just take it for free in the first week, so you can leave it as is (like a feature).