Japan might I think, which would make it even funnier if this Japan is Britain and Britain is Japan because then you'd have a Japanese Brittany
But speaking of France, I wonder if it would be feasibly for the asian "France"(Korea? If following previous comments) to have a protectorate on the european equivalent of Indochina
I don’t think it’s feasible to transpose
all of Asia onto Europe, the latter is simply too small for that. The way I see it, continental Europe is supposed to represent just China, which means the equivalents for the various Asian countries that are bordering China would be located at the periphery of the European continent. So Britain is Japan, and Korea is maybe Ireland or Scandinavia, Tibet is possibly Anatolia or the Caucasus, and Taiwan maybe is Sicily or Cyprus or something like that. In which case I think the most plausible equivalent for South-East-Asia (Indochina, Siam, Indonesia etc.) would be North Africa and the Levant.
So this TL’s version of Indochina could either be Egypt (with the Nile mirroring the Mekong), or maybe Morocco. Gibraltar could be the new Hong Kong, and either Djibouti or Aden could be the new Singapore (due to their strategic location between the Red Sea and the Indian Ocean, mirroring Singapore’s location between the Pacific and the Indian Ocean). If we follow colonial history in Asia, then Europe itself won’t be directly colonized, just like China wasn’t (with the exception of small foreign concessions and ports like Hong Kong and Macau).
The big question in all this is if India remains as it is, or if it assumes a different role, because there’s no other country or region in the world that could take India’s place, mostly because (other than China) no other place could realistically support such a large population. If Japan is Britain, and is supposed to take Britain’s place as the world’s most powerful global empire, then it pretty much needs to colonize India. There is no other place that would be of equal value. In which case this TL’s equivalent for the Ottoman Empire would probably be located in South-East-Asia. Maybe a more successful Khmer empire that conquers most of S.E Asia and Indonesia and disrupts trade between India and East Asia, thus creating an incentive for the East-Asian countries to sail east to explore a different route to India, leading to the discovery of America?