Oh, but there are many reasonable people, but that isn't what Kant was talking about, I think.

And Kant didn't say there were universal laws for "good", he even denied that: "It is completely impossible to think up something in the world [...] that can be considered "good" without restrictions ...".

One of the things he said was "Act as if the maxims of your action were to become through your will a universal law of nature." That's just speaking hypothetically. The categorical imperative is a feature of the autonomous moral consciousness and not of heteronomous moral systems, it has nothing to do with universal morals and duties, or universal laws, coming from without, it's just a way of thinking about morals that come from within. Not all that far removed from that "wisdom" you mentioned, no? He calls it "good will".

But let's not go there anymore; I have long since rolled my own morals.