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In a robot imp individual, I responded 1♥ and, as I feared, I was never able to express my extremely high slam interest.
On reflection, I believe I would have been better off responding 2♥ even though this would have promised "rebiddable hearts." As Charles Goren wrote in a different context, "It is better to lie about a deuce than about a king."
Any other ideas?
In the homegrown methods I played with my late wife, the 2NT response to any suit one-bid showed 16+ without a six-card suit or two five-cards. It worked wonderfully.