WI: Development of Japanese Imperial Family without Post WW2 Treaties

I've been wondering what would it look like had if the Imperial House of Japan (or House of Yamato) - especially its family, kazoku and noble laws had left mostly untouched after WW2. This could apply to OTL without much change to everything else in TTL, to ATL where Japan conditional surrender terms are accepted, or... more wackily... under Japanese and/or Axis Victory scenarios.

In OTL, post-WW2 treaties essentially stomped whatever could the influence of the Japanese Imperial House could have over the government and country. The treaties made them more or less just a symbol - which sort of made them more of a republic with a ceremonial monarch. They also made changes towards the Imperial Household law wherein the princesses/female nobles lose their titles, claims to the Imperial House or so as soon as they marry a commoner (which is basically everyone else but their own family/noble clans) that would most likely lead to its demise/downsizing in the near future - perhaps even extinction if nothing is done as necessary.

But what if that's not the case - focusing with the scenario in OTL? Let's say that the US officials, maybe MacArthur believes that a monarch is more easily manipulable or so to whatever the US can influence them - than just giving much more power to the democratic/republic system of Japan. Thus, the Imperial Household Laws are kind of left to be untouched since Meiji period would mostly be left untouched from the war. The Japanese Royal Family still some of the assets and such seized, but mostly to prevent its militarization and influence over the government, and the system of monarchy would be basically be based off the Norwegian or British system (where they may have some executive powers, but must be approved by the council as necessary).

What would this family be like compared to OTL? How much larger would it be, especially with the inclusion of kazoku and other such clans in there? What would be the theoretical Imperial succession look like here (you make make some alternative pathlines like of that to presidents in different articles)? Any changes to what could be the Japanese government from here and thereon? Short-term and long-term effects - maybe some other butterflies as well?

Bonus: A princess of the Japanese royal family marries an European royal (maybe the UK), what happens to them under this pre-WW2 law... and how different would it be from OTL laws? And some geopolitical effects (even if minor) as necessary?
 
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Theoretically there would be less fuss over succession if there are more people in the line. Women would probably not lose their royal status once they married. If a Japanese princess marries a UK prince then she would be UK princess by marriage. If this prince is in line to be king, though, then she would be queen. Since she can't be queen regnant of Japan, there won't be personal union.
 
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