Kit, you say:
It could be right to cross to the ♣A, cash the ♦A discarding a club, and play ♣K and a club hoping to set up an end-play against East. Alternatively, you could not cash the ♣K but ruff a diamond back to your hand and perhaps play ...
Agree. We were playing 3♥ as a mixed raise, with no preemptive raise available. Gavin said that since he began playing the jump as mixed, he has never missed the preeptive raise. I told him to remember this hand next time he says that.