My count was the six Type IIA boats, the two Type IA boats, and guessed at 6 Type IIB boats. As far as I can tell, there were no Type VII or Type IX boats being built on 1 Jan, 1936. I gave the Germans two flotillas (10 boats) of Basic Short Range submarines.
I have to differ with you, as I can verify exact production details. The U-boats were started in lots, and it appears that each lot is counted as a complete group. Further, these were not old WW1 boats., Germany secretly developed new sub technology building new subs for another country before it started it's new program. This technology was ready in 1934. Therefore germany SHOULD start with much more advanced tech here than the other countries, as it was historical. With reference to the actual boats, it appears you are only quoting production from AG Wesser in Bremen. The MAIN production, pre-war, was at Deutchwerke and Germania (both in Kiel). I'll list the production in groups, sorted by dates. As you can see, even I was off, as there should be 36 boats (7 groups)
1934 2 Type IA AG Weser U-25 thru U-26
6 Type IIB Germania U-7 thru U-12
1935 6 Type IIA Deutchwerke U-1 thru U-6
4 Type IIB Deutchwerke U-13 thru U-16
8 Type IIB Germania U-17 thru U-24
6 Type II AG Weser U-27 thru U-32
4 Type VII Germania U-33 thru U-36
As you can see, 36 boat (7 groups), not two. Please adjust. I would say that the HOI version puts the Costals in Kiel, and the Atlantics in Wilhelmshavan. These were all being used as training boats, to prepare for war.
Type VII should be available, and Type IX should wait for the Tech. So you can add them to the "Build Queue", here is the 1936 figures.
1936 11 Type VIIB Germania U-45 thru U-55
8 Type IX AG Weser U-37 thru U-44
Therefore, I would put an additional 2 groups of mid range boats in queue, and require the tech for IX, thus completing the first IX boats by before 1937
Improved boats start coming out in 1937, as shown below, so do your techs permit improved boats being available? Production below.
1937 8 Type IIC Deuchwerke U-56 thru U-63 (Advanced)
4 Type IXB AG Weser U-64 thru U-68
1938 4 Type VIIC Germania U-69 thru U-72 (Advanced)
8 Type VIIC Germanic U-93 thru U-98 (Advanced)
8 Type IXB AG Weser U103 thru U110
In truth, it's really hard to find the definition of an "Advanced" coastal. The Type XXIII (Closed cycle Coastal) was just a byproduct of XXI production, built at shipyards that were not committed to type XXI.
Hate playing devil's advocate, but I have all the production, stats, etc. for the Kriegsmarine, as I have been researching it for years. Hope you are finding this helpful, not annoying.
Cheers