Have you ever thought about your DAW working as a software arranger with auto accompaniment?
As in: you play chords on your external keyboard and the song in your DAW responds live to your chord changes?
As in: you write a four-measure pattern in C major, and then play (and record) a whole song over that pattern, by just playing your chord progression with your left hand and the melody with your right hand, exactly as on a keyboard arranger?
Or as in: when you arrange your songs, you write just the melody and the chord changes on one track, and everything else automatically happens on all the other tracks?