I don't buy it. For a start 26 knots is way too high for such a boat, it would have meant sacrificing underwater performance to the extent that it would be able to dive but not much else. WW2 submarine design had already to deal with such a delicate balance between surface and underwater perfomance that throwing in a substantial artillery armament, with its attendant requirements in terms of stability, supporting equipment, armor mass etc made the problem effectively untractable.
Improving one area could be done only by robbing perfomance somewhere else. Technology could help a bit but that would cost extra money and time.
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