"I have not double checked the stats for the Swordfish, but woulnt the B5N be a viable substitute?"
There is no substitute for a Swordfish, it's unique.
Cannon fodder? All too often the case, but it didn't deter the aircrews of the Fleet Air Arm from attacking whenever and wherever they found the enemy. I couldn't care less whether 'it won't survive in the MA' or not - but I'd like the chance to fly the aircraft that succeeded against the odds and crippled the Italian fleet at Taranto, sank hundreds of thousands of tons of Axis merchantmen in the Mediterranean, protected the vital Atlantic convoys from U-boat attack by flying off and landing on the smallest operational carrier decks ever built (the MAC-ships) - and took on the greatest concentration of German warships seen in WW2, when 'Winkle' Esmonde led his 'forlorn hope' of half-a-dozen Stringbags against
Scharnhorst, Gneisenau, Prinz Eugen and their air and sea escorts even though he knew he hadn't a hope in hell of surviving.
Yes, I'm one of those weirdos who like to re-create and test history by using a good combat flight sim, not a MA arcade-gamer - so I vote FOR the Swordfish. And the US Navy's Douglas TBD-1 Devastator.