I dropped it onto the yellow square bit that you have to navigate around on the lower level. I used that yellow rail along the edge, with Yooka's body propping the ball up against it and walking it round. It was a hell of a balancing act, hence I failed a few times.
I did think about getting a box, but I'm a bit stubborn, after getting close a few times, I didn't want to give up!
On that screenshot I took, I had to roll it across a line next to the world edge, I lost the marble and had to reset the game way too many times.
Your method is good too /I guess/ :p.
If I get this screen capture stuff working, then I'll maybe pop up a video at some point (if I can replicate it. Regardless, I can do one that gives the general gist of things)!