Monarchist-catholic is senseless in Italy. Crown and church in many countries got along but in Italy they could not stand one another, a pair of kings were even excommunicated for the "crime" of occupying rome which the pope thought his own. VE III was profoundly secular and even a little anticlerical...
Yeah after doing some reading it looks like the Catholic Church ended up backing a Catholic party for parliament back in early 1900s before the fascists split it in half. So I guess the Church will end up sort of chilling in the background for most paths