Handle with care

Jim, a guy I work with, played this deal at the local club last Thursday (low cards are approximate where not important):

                 ♠ A K J 8 6
                 ♥ K 9 6
                 ♦ K 2
                 ♣ A 4 2
==
                 ♠ 5
                 ♥ A Q J 7 2
                 ♦ A J 9 8 3
                 ♣ Q 3

Jim was South and declared 6♥ after the lead of a low spade. How would you play?

Most declarers drew three rounds of trumps (they split 3-2), then played on diamonds. Because of your strong spot cards, you're likely to bring in the suit. That's not a bad line, but Jim saw an extra chance.

He played only two rounds of trumps, then played the ♦K and another diamond. East discarded! He won the ♦A and led the ♦J. West covered (ducking would do no good), and Jim ruffed in dummy as East discarded again.

Now it was trivial to discard a club on a high spade, play the ♣A and ruff a club to draw the last trump and concede a diamond. In all, he took: five hearts, two spades, one club, three diamonds and one diamond ruff for his 12 tricks.

Here are all four hands (East-West cards are approximate):

                 ♠ A K J 8 6
                 ♥ K 9 6
                 ♦ K 2
                 ♣ A 4 2
♠ 4 3 2                        ♠ Q 10 9 7
♥ 10 8 3                       ♥ 5 4
♦ Q 10 7 6 4                   ♦ 5
♣ K 9                          ♣ J 10 8 7 6 5
                 ♠ 5
                 ♥ A Q J 7 2
                 ♦ A J 9 8 3
                 ♣ Q 3

Jim got a top for bidding and making 6♥. Three other declarers bid slam, but went set one. How would you have done?