I think I would. Different propulsor and sail is one thing, but completely reworking the torpedo room doesn't make a great deal of sense with regards to the backstory.
Some WAAs of some sort would make sense, if you want to go that route.
It is sobering to think that my approach here was 'MUAHAHAHA I shall be the glorious indomitable be-all and end-all of all missions forever!', and the Soviets thought likewise and then went ahead and BUILT it.
Because, honestly, who cares about ship-launched Harpoon? If you had more money (and open VLS cells) than sense, sure, but there are better things to do.