I played this from the piano-reduction, which is available from Oxford University Press.
The original-piece is for Baroque-orchestra (the same instruments as needed for the 5th Brandenburgisches Konzert by Bach).
I played 2 performances as the Cembalo-player and a performace with piano in parts.
This suite is a challenge for the solo-flute-player, this movement "Aria" is not so difficult like all the other movements.
The combination of Fl.harm, Gedackt and Tremulant in the HW of Billerbeck is a wonderful solo-voice.