I don't know any way to change playlist with a keycommand. Maybe you can have the the track in playlist view (so all the playlists appear under your track) and have a shortcuts with QK that copy the first-second-third-fourth-etc. playlist to your main track... just an idea.
What you ask, IF Pro Tools supported applescript (or any other script language) could be added easily (I think): I'm trying to ask for applescript support for Pro Tools, maybe you can spread the word.
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