The hybrid-carrier idea was not uniquely Japanese

Did the United States consider Second World War battlecarrier designs similar to the Japanese hybrids?

Yes, proposals existed, although the American drawings had not been located for this discussion. Japan was distinctive for implementing a minimal conversion, not for being the only navy to consider the concept.

Battlecarriers were not an exclusively Japanese curiosity. American proposals existed, although the drawings had not been located for this discussion, and the stream also examines a published British design. Other designers tried to combine aviation and heavy surface firepower, but paper studies did not have to bear the operational compromises of an actual ship. Japan's Ise conversion therefore deserves criticism for its facilities and mission fit rather than for originating an idea no other navy entertained.