So, after the discussion in the thread I've opened where I proposed to take Rhineland pretty late, I made a test run for that benchmark. My buildup was as follows:
Focuses:
1. Directly go to the extra research slot via the 12 extra civs.
2. Go for research agreement with the SU to be able to produce medium tanks far earlier than anyone else
3. Reichsautobahn -> Rhineland -> War economy
4. Now go for Anschluss and the Czech focuses to "liberate" all Germans into the Reich. I squeezed in the first focus for the refineries.
5. After taking all your rightful terrotory, take the focus for getting the +2 rubber for each refinery.
6. Now go for Molotov-Ribbentrop pact followed by Danzig or war.
Buildup-strategy:
Until 37, just build civs in the state with 80 an 70% infrastructure, including the four which will profit from the Autobahn.
In 38, pump out Mils (and perhaps squeeze in a few docks if you want to)
In 39, switch to refineries
PP-Spending:
1. The first advisor is Schacht. After him improve the working conditions to get the extra stability early on while the productivty malus doesn't hurt so much.
2. This is followed by Bormann.
3. Now you can take those research companies based on your preferences.
4. In 38 when you switch to MILs, replace Schacht with Funke.
Research:
I avoided researching ahead of time and did this only a few months to not suffer from the research penalty too much. I didn't min-max my research for optimizing this benchmark, but made it balanced.
Military equipment: I didn't build any light tanks at all, and initialy only few small arms. I relied on the Austrians and Czechs to build those for me.

Instead I built a large amount of trucks, artillery and fighters. Once the extra mils came in I kept building the equipment I saw as essential for the war against Poland and France early on. So I had to import a substantial amount of rubber, tungsten and later also aluminum. My aim is to be self-sufficient with rubber once the war starts, though, as the supply is simply cut off.
Spying:
I built an agency in 1937 to set up collabaration goverment in Poland and France. I also improved their cryptology department to start some deciphering for those sweet bonuses.
I also propose that for sake of such a benchmark to include the amount of owned "stuff" - Obviously you can get ridicoulus amounts of factories with such meme runs, but I'm pretty certain most of us wouldn't see those as really strong "openings". So I'll count how much IC-days of equipment I own.
So these are my results for June 1939:
Civs: 93
Mils: 93
Docks: 13
Refs: 8
Collaborations: 1 in Poland (finished) and one ongoing in France (Although the civ-investement is already done).
Overall benchmark: 1873200
Owned equipment (land + air): 287807 IC-days
Produced ships: 4 Type II U-Boats, 18 Type VII U-Boats, 2 BBs, 2 CAs, 14 DDs