Monarchist tree should definitely include a roman resurgence. However I think there should be 2 branches to the monarchy tree one that goes to the roman resurgence and the other goes to a coup of the current king. I'g going to add you cuz now im really interested in seeing this happen and would like to explain my idea in depth.

baguettes

Expanding on Overlord's idea, Victor Emmanuel was for all intents and purposes a Fascist however Umberto sided with the Allies. Perhaps the monarchist tree could be split by;

1. Emmanuel Lead's - "Victor Emmanuel must stay on the throne, he is the soldier king etc etc" this might give a boost to war support but also and 'acceptance of fascist diplomacy +85' which means it is still possible to side with the fascists but changes their imperial focus from African to European (so instead of going after Greece, securing the suez etc there is a more direct route to Austrian, French and Swiss claims like the first world war. Perhaps culminating on the claims on Turkey)

2. Umberto Leads - "A change in King is needed for the new world, yada yada". It was no secret however that Umberto was not a charming guy so perhaps he could get a similar effect to Edward the 8th 'inexperienced imperialist'. He would be the opposite to Victor Emmanuel in that he would add stability and 'acceptance of democratic diplomacy +85. This would of course be the much less interesting route.

Think of the choice between Militarism and Shoa constitution for the new Japanese focus tree.

Maybe a focus that would be aligning with the pope and starting a crusade again for ♥♥♥♥♥ and giggles

Making the pope the leader adds cores to every Catholic country on Earth

I have a small suggestions - instead of annexing Bulgaria focus, maybe do a similar thing to Germany, that you simply "allign" them(puppet)?

I'd really like to see the ability to either join Germany's or make your own faction added back. That's in vanilla and it's missing from this mod.