If you want a post-1900 PoD, more smoother war with the Ottoman in 1911 achievied with the political and military enstablishment being more decisive and aggressive in the immediate start of the conflict, in this manner the cost (both economic and social) will be more limited and the butterfly in the Balkan minimal. As a plus, a much less problematic Ottoman war mean that Cadorna is not the Chief of staff of the army during WWI.
With the start of WWI, the best option are to get rid of Cadorna the quickest and getting someone that can manage better the men (soldiers and officer alike) and have a more conciliatory relationships with the politicians, if a national unity goverment is created from the beginning things will be more calm during and more importantly after the conflict..
Avoid Caporetto, lessen the total loss (even the cost of the war if the better management reduce the duration of the war) and keep the italian delegation at the Versailles conference and not only you will get a better treatment both (colony included) but you will avoid Benny