Hi. I am contemplating booking a Vatican Museum Tour along with St. Peter's Basilica which would help in skipping the lines at both places. But I believe that I would miss Momo's spiral staircase (I am a hobbyist photographer) which is now exclusively used as a museum exit and all tour groups including the basilica would exit through a door leading into it. I have already mailed the tour company and they don't include this in the itinerary. As per info gleaned from the forums here and other places, the staircase is adjacent to the entrance. Would it be possible for me to make a beeline for it after going up the escalator and rejoin the tour group a few minutes later? Would there be any obstacles while attempting to do so? Can somebody give me directions as to how to go about it? Thanks.