Actually I do have it! Someone else had asked for it a while ago and it was really easy to export from the original iMovie file.
Shooting you a PM.
I forget where does the Italian track that you have comes from
It’s from Poita’s Italian version scan - the one this version is built from. My grindhouse version is synced to the Laserdisc cut so the shot order isn’t the same.
Making this Italian track was very simple: I just muted the English audio track and unmuted the Italian sound. Export Audio -> Save.