Personally, I don't see a problem with spinning of a new realm by secession rather than by CTO, especially given that CTOs are no longer possible.
Correct me if I'm wrong, but aren't strategic capital moves what are restricted, not secessions? Are strategic secessions actually banned?
Strategic secessions and strategic capital moves are both banned. You can have a peacefull secession, but not a strategic one to gain advantage in a war.
