I'm not against keeping the XXI, but there should be limitations to simulate it's late availability and problems in getting them into service. Apparently the first ones were commissioned late June 1944 but there was no patrols done before march 45. So my guess is they should be available in July 1944 with a waiting time of 6-7 months...
As for the VIIC/42 it should not be available at all (none were ever completed).
I've seen others talking about the XXIII. Even if graphically it would not be right, couldn't it be modded as a new version of the type II ? After all type XXIIIs did see some action and were quoted in one of the books I have as 'the best submarine of the war'.
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