Since the models for them already exist thanks to SH3 maybe throw in the odd U-Boat or German armed merchant cruiser. There was one German merchant raider...the Michel I think...which was sunk by the US sub Tarpon off Yokohama in 1943 after refitting in Kobe, Japan. The Germans were rather annoyed that she hadn't been given proper escort.
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--Mobilis in Mobili--
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