You called it "Kingly" ambition in your post, which is a direct reference to recent chapter and King's words regarding CoC lol
Anyway, ofc it's a hard dream. Most of SH has insanely hard dream.
Nami also wants to draw the map of the world. Honestly, one of, if not the hardest dream in all of OP, even if you don't specifically need combat for it.
Then there's Franky wanting his ship to sail to the end. A dream directly tied to Luffy's.
Zoro with WSS. Luffy with PK. These are obvious.
Sanji wishes to find All Blue. I personally think it's a place at the end of Grand Line- or possibly similar to something like what
@Sugar said. Either way, it's end game stuff (I personally think it'll be narratively important, as well, but we'll see)
I guess Brook's ambition is one of the easier ones; meeting Laboon and stuff.
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I said there are some arguments you can make for CoC, but this just ain't one.
I'm not generalizing it to anything. But as for WB, he obviously got CoC due to his disposition as a leader and an insane pride within himself. Dude stood up and threatened to fuck Shanks' shit just because the kid got a little cocky in front of him and acted like he knew better (which he even did lol). WB didn't want to be King, but he sure as fuck didn't tolerate being treated as beneath anyone.