Mixing skills at 50

[Sephrick]

First note: Attribute points are independent of class. So when you level your Conjurer, you'll be able to load up on Mnd and Vit, allowing you Blm to focus on its own stats.

To answer your question: None. Blm are locked out of Whm/Cnj. Blm has access to only Archer and Pugilist actions.

However Thm may still mix and match from all of the other classes.

EDIT: Here's some starter info on Lodestone about it.