You can shim a stem to fit smaller bars. I did this for a while and it is a minor complication but it works fine.

Also, check Velo-Orange for their silver stems. They have Nitto Technomic quill stems with reach as short as 60mm and threadless stems beginning at 80mm. The Technomic is a long quill but you can cut it if you need to shorten it. None of these are vintage italian stems but your bike won't care.