The only reason to do anything other than keycard is concern about missing grand opposite something like AQJxx Kxxx Axx x. Maybe he can bid it after I tell him we have all the keycards...it is plausible to assume I hold help in spades in order to invoke keycard and, if not, the K rates to be onside some of the time
Meanwhile, no alternative comes to mind. Blasting seems unilateral since we could be off 2 keycards, altho if I was limited to one call, ending the auction, it would be 6
♥.
I don't like the methods, but I don't think that other methods would necessarily help. For example, playing transfers, which I like here, we'd have the same auction through 3
♦, and I assume that partner has the values to drive to game when I transfer...I like partner to bid as if I held weak 2 values. However, it is, I suppose, possible that with a hand that makes grand good, he'd cue 4
♦ on the way. As I say, it probably makes no difference.
I can't imagine ever wanting to support spades after this start, btw. It might be nice if doing so would set the stage for 2-suit keycard, but why should it when we haven't shown hearts yet? Besides, 3
♠ isn't forcing (not a treatment I like once overcaller shows values and I have promised a strong hand....3
♠ should, imo, be forcing) and 4
♠ ends the auction 99% of the time when I hold this hand.
Cuebidding a minor is no use....clubs is natural and 4
♦ can't get us more info than would an immediate keycard and might add confusion to what should be a simple auction.
'one of the great markers of the advance of human kindness is the howls you will hear from the Men of God' Johann Hari