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Grand Duke Leopold of Tuscany was fairly liberal and in 1848 there was some brief discussion of establishing a Central Italian Kingdom with Leopold as King as part of a wider Italian Confederation. Issue was, the Grand Duke saw Austria's success in Italy and decided it'd be better to go to Gaeta with the Pope.
Let's say Leopold instead opts to not only become king of Central Italy (which I assume would correspond with the 1859-1860 polity's borders) but also convinced his family members in Vienna to cede Lombary and Veneto to his new Kingdom - establishing an Austrian-allied Kingdom of Italy.