With a 1870s POD or later, try to get some Republican sentiment in Italy.
The goal is that in 1911, a work strike turns into a revolution. The republicans are in the minority and Po River Valley, Tuscany are still hotbeds of royalist sentiment. The rural areas are 75% neutral, 24% royalist.
However, despite the royalists outnumbering the republicans as much as 3 to 1 countrywide, they are concentrated in many cities including... Rome. The King loses his nerve and flees Rome, disappearing completely, leaving the royalist cause headless. They just sit around and wait while the republicans consolidate power until it's later revealed the king fled to Vienna.