I think you should be able to on a wind current boundary

> from the point of view of the balloon it is not moving.

Mind == blown*

*Sincere, but pun intended

Wind is still flowing over the balloon and able to generate a steering force.

No, as Walter said, it's moving with the wind, i.e. it has the same speed as the wind. It's only if there's a sudden gust that you would see anything flowing over the balloon. I took part in a balloon experiment a couple of years back, essentially a weather balloon with several cameras, including one pointing upwards - we could watch (after we retrieved the cameras later) hours with footage of the balloon itself. There were various loose threads etc, and I assure you - there wasn't much movement! Occasionally there would be a little gust, when that happened the payload would swing around a little bit, but for the most part it was very quiet. Particularly at the highest altitudes.

This is interesting https://www.youtube.com/watch?v=jyQwgBAaBag

Forgot to include: We had microphones up there too! It was literally quiet.