I presume the Gladiator as a 'strike' aircraft was a finger trouble moment but the closest predecessor to the Fulmar was the Skua which itself was the replacement for the Osprey as a strike fighter. Stressed and trialled for the strike task, albeit without the steepest dive crutch of the Skua, the Fulmar would be replaced by the Firefly which also was strike tasked. That the Fulmar was solely employed as a fighter as the main role was an accident of history. If the RN had a purpose carrier fighter then the Fulmar would have carried much the same tasks as the Firefly. We should see the Fulmar as a better Skua and not a poor Hurricane. An early Firefly not Seafire.
Much as I would like to see how fast the butterfly can flap with a snort of cocaine, it is difficult to find a plausible POD to get a more powerful motor into a service Fulmar in 1940 or even 1941/2. However the airframe is a sound multi role one save the torpedo launching. I just wonder if it could be possible to, with as little change as possible, squeeze a torpedo under a Fulmar?
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I personally have severe doubts but if one could then the RN only needs one type on its carriers. The multi role Fulmar. Fairey had proposed more than one torpedo carrying monoplane alternative to the Swordfish to Their Lordships. The wing area should lift it off the deck. However, I digress well beyond the OP.
My Theory, put a torpedo where the Bombardier was, and put a 2000HP Monarch in the nose, and a hook in the rear, and 20mm wing guns where the wing bomb cells were. Change that '257mph' to '357mph'