During that time he acted for rent-money in one of my favorite films, Wim Wenders' "An American Friend" with Bruno Ganz. It was a retelling of Highsmith's "The Talented Mister Ripley" and in my opinion the best of the lot. See it if you can find a copy.
He was also in a Season five episode of “COMBAT!” on TV (about 1965). He played a jazz drummer with the USO who gets lost at the front and ends up in combat. He had that edge showing even then.