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You can pick any words for a Hive master key.

Bips requires us to use 12 of the 2048 words given.

This is new to me. Where can I select words for a new Hive master key, so far I have only that long 6pYuTVRYZ2C-type of thing.

Surprisingly, the master key doesnt even appear on the blockchain. it is simply used to generate the other keys (off-chain function) and can be any string. your master key could be "password123" if you choose. The keys it creates would still be the standard ones we're used to.

There aren't a lot of front ends that let you mess with the master key.
I guess I should write a custom script it would be easy.