I cut the head off of mine, right above the collar. Then I mounted a ballhead by using the top plate of a ballhead I had laying around. It was surprisingly easy to do. It is my most used tripod because it is just the right size. I still use my carbon fiber Gitzo for large format though but the Tiltall would easily hold it too.
The only downside to the Tiltall is you can't get loooow. But I guess Irving Penn knew that. Lol.