Is it possible to have a small percussion line in between the two piano staves?
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You can.
Use two pianos, one with the treble clef and one with the bass clef.
![MuseScore 3 Evolution_ Untitled.png]( "MuseScore 3 Evolution_ Untitled.png")
But this is a workaround. The instrument name has to be adjusted, the brackets have to be enlarged and other things ...