If you wanted to, you should add the countries as actual ones instead of just revolter tags as long as it's previously uncolonized land. Nenetsia, Yugra, Sakha, and Mukhtuy should be in 1444 as either a horde or siberian native council. In 1444 you should add Shuar, Guaycuru, Agikuyu, Querandi, Huarpe, Quisqueya, Moxos, Sugpiaq, Kalaallit, Sayisi Dene, and Dene Tha as migratory tribes. You should add Motu in 1444, but they should probably only have one province, don't know which it would be. You should add UluBemba, !Urill’aelona, Kwararafa, Duala, Wanga, Urambo, Uhehe, Agikuyu, and Payiri as spawning by event like Fulo/Ashanti/Funj.

@Novvelian
That's not a bad idea for a related mod, but defeats the purpose of this one.
This is meant to be as unobtrusive as possible, barely modifying vanilla except to add these tags.