You'll have to dissmiss some of your crew in order to use the IIa and once they're gone they're gone as far as I know so if you move up a boat again you'll have to recruit fresh replacements. If you save your reknown up you could recruit some well qualified men to help make up for the loss.
Myself the loss of the stern tube stops me swapping back to a type II boat, that stern tube comes in very handy indeed. Claimed more than one or two swines trying to depth charge me to bits.
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