If it isn't too much work there should be a "Random extreme terrain" map options. Out of 10 map rerolls, most of them are flat and boring

Farthest Frontier Ideas and Feedback
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You can move the TC, it’s not easy to do because of the desirability it gives, but it can be done. Use the Clear option and choose buildings then drag the cursor over it.

See here for many examples of players building on mountain tops that they’ve flattened.

Peninsulas and even islands have been built on too. Just depends on the map roll.

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