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Help with Picking a Key Signature

in Piano

Hey, I am currently working on arranging a song by ear and currently the flats and sharps are all over the place. I need help with picking a key signature for the piece. The chord progressions goes like this and changes about every 2 bars:
Ab minor, C minor, Ab minor, C minor
B minor, Eb minor, B minor, Eb minor
C# minor, G# minor, C# minor, G# minor
D minor, A minor 7, Bb minor 7, E minor

Then it repeats from the beginning again with the Ab minor, C minor stuff. 

It is fine if it changes key signature every once in a while as this piece seems to modulate between keys quite a bit. I can't be changing key signatures every 2 bars though. What is your opinion on key signature? 

Here is the sheet music:  
https://musescore.com/user/17126126/scores/5978608