I am also absolutely sure that I am NOT passing 3N should he bid it over my 3♦ (nor would I bid it or look for it after a pusillanimous 2♦). We need him to have the ♦A, with sufficient length that he can hook the (probable) K onside or play for the drop or he needs the K and 2, count them, 2 stops. While I appreciate that 2♦ followed by 3♣ sends a message, I can't see how partner isn't going to bid 3N over that with Kxx in diamonds, a 10 count and one club stopper, for example. He'll know you need help, but he will think the so-far unbid Kxx in your long suit is that help.
This is not a hand that looks for notrump. Furthermore, I wouldn't worry about waiting to find a fit before upgrading: I'm looking at my fit already
We become so biased against minor suit contracts that I think we tend to strain for 3N too often. This hand is about diamonds... and maybe a lot of them. Ok... opposite xxx Jxxx Axx QJ10, maybe it's about 3N and I'm not getting there. I can handle it

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