In truth, I would never splinter, in an established partnership, with 22 high, 5 support headed by the AKQ and a LTC of 3... my god, I have a 2♣ opening bid, just made even sounder by partner bidding 1♠!
I would cue to establish the force and then raise spades and hope to elicit a cue... and I don't care if it is in hearts or clubs... I'm gone to 6 in a heartbeat.
Now, if I were worried that partner would pass a sequence that began double then cue then spades, I'd splinter and bid again.
On the given hand, as the 1♠ bidder, I can live with either the conservative 4♠ or the aggressive 5♣... I would never keycard because I don't know enough to know whether to commit to slam opposite a 3 keycard response... AKQxx x AJx KQJx.. and surely, if we'd splinter with the monster he held, we'd splinter with this... and no prizes for guessing where the ♦ King is

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