Agree in full with your plan, and thank you, Jane!!
To address the question as to why I do not always carry my passport in an Italian city:
Because I feel that it is safer for me to leave it in my hotel room than on my person, especially when I am walking around alone late at night, or walking around in a crowded market...or taking a crowded bus (rarity).
For me, and I stress that this is only MY personal view and I am not advising anyone to follow my lead, I feel that being asked for my passport by the police and not immediately producing it, would bring far lesser consequences than having it nicked while walking about on my own.
Let's imagine: I'm walking home from a visit to the market in Trapani when I am stopped by a pair of uniformed officers. They ask me to produce my passport. I tell them I left it back in my hotel. My guess, and this is only a wild guess, is that if they want to see it, they will return with me to my hotel and I will produce the document..
Obviously all speculation...
And then...and then...... I'd love to hear from anyone who has had a similar experience...