@Charles:
If you want to have the full experience, also use this neutral expansion ruleset along with the new powers:
https://www.axisandallies.org/forums/index.php?topic=38615.msg%msg_id%
All playtests of this addition of 11 powers used these new neutral rules, and I definitely recommend you play these two house rules together. It allows for fun things like South Africa invading Portuguese colonies, Bulgaria and Italy invading Turkey etc.
We are currently working on implementing the 20-power ruleset for other Global setups. If you would like to play this add-on in a Pacific/Europe solo game, I can post the theater rulesets on request.
Charles De Gaulle, has your group worked on any other setups recently besides 20 powers in 1940? I am formally putting in a request (or fan vote) for 1936 with with 20 powers. Maybe some of the smaller countries that weren’t conquered by Germany yet could act as pro-allied neutrals. I just think 20 powers would work well from an early starting point. More variables to “rewrite” history to some extent. Anyways thanks for your efforts.