I don't play the fiddle and know nothing about bowing styles, but I do know that classical violins and folk fiddles are virtually the same thing. We had a fellow join our session who is both an award-winning music teacher and a superb classical violinist. He had severe difficulty in chiming with the rest of us. He was used to learning and playing music from the written note. The concept of chucking in your own ornamentation and variation on the fly didn't sit well with him for a long time, and learning by ear from other session musicians was well outside his comfort zone (he loved it all and rose to the challenge admirably, over time). I think that classically-trained musicians do have the inner resources to adapt to the far more informal ways of folk music, as long as they do what we should all be doing - loving and listening hard to the mores of folk music traditional playing. The one extra thing needed is the motivation.