If I may make a suggestion, Ducimus......... leave the IXC U-Boot in TM. Although they mainly operated in the Indian Ocean, the chances of meeting them in NEI waters (which were allocated to the USN's area of operations) were very real. "U-168", for instance, was sunk off the Java coast in the Java Sea by Hr.Ms. "Zwaardvisch", operating from Fremantle.
Furthermore, two were transferred to the IJN: U-511, a type IXC, was transferred to the IJN at Kure in August 1943 and became RO-500; she was mainly used for experimental purposes in Home Waters, surviving the war.
The other was type IXC40 "U-1224" which was commissioned at Kiel in October 1943 as RO-501. She was sunk en route to the Far East in April 1944, 400 miles SSW of the Azores.
So although hardly an overwhelming number, they do make welcome extra targets for USN subs- and a quick and easy submarine addition to the IJN Roster!
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