Dicfish has uploaded the alternate ending on Youtube:
This is now a version with Italian audio. I didn't knew before that such a thing existed, and it's dubbed existence proves that there was done more work with this ending than only shooting it, and that it probably really was considered to use it. Otherwise there was no need to dub the silent footage.
Now we need an Italian (or a sharpshooter) to dub for us the (hopefully silly) dialogues.