Random and Shattered Dynasties

So I know if you just want to shatter the world, you can do so through the rules and keep the same dynasties. However, I would like to play in a random world, still keeping the same dynasties. The random dynasties are sometimes fun and interesting but a lot of times it is just generic banners which pulls me out of immersion.

So is it an engine limitation that prevents keeping historical dynasties in a randomized world, or does anyone know of a mod or submod that allows you to keep them?