One piece that might work for your ensemble is Lennox Berkeley's Concertino
for harpsichord, recorder, violin and cello, op. 49. It's in four movements
(the second movement a duet for recorder and cello) and lasts around 14
minutes. The score can be found in many university libraries.
You can sample it on youtube.
I. Allegro moderato: https://www.youtube.com/watch?v=_4uA_o_6ZCI
II. Lento: https://www.youtube.com/watch?v=I8mZSMm8Lr4
III. Andantino: https://www.youtube.com/watch?v=8zXFAzQ267I
IV. Vivace: https://www.youtube.com/watch?v=PNIx0pohLhk
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