Nevertheless I like the idea of a completion and came up with the following myself, also based on "Rosamunde":
Andantino in G (Ballet Music 2)
Introduction: Andante in D (Entr'acte 2) -
Exposition: Allegro moderato in b/B (Ballet Music 1, 1st section) -
Development & Reprise: Allegro molto moderato in b/B (Entr'acte 1)
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