I think the CNT/FAI revolting and starting a three sided civil war most of the times makes little sense, so I would like to propose something.
What if the CNT/FAI (Regional Council Defense of Aragon) starts as a "puppet" of the Spanish Republic? Of course, the Republic would lose control of their territory (and factories and troops), but the Anarchists will still fight the Nationalists as allies in a war, but not the Republicans, and take territory for themselves ("expanding the Anarcho-Synicalist Revolution" through Spain), although maybe there should me a modifier to make them deny any kind of land occupation request... If not, they could instead appear as an ally within the same facion (similar to the United Chinese Front, but considerably smaller)
...HOWEVER...
...The master-puppet (or ally) relationship would break once the Soviet influence is too heavy, and then you will have the civil war between them. It could happend before the Nationalists are defeated (if the war goes well) or before, thus unleashing the three sided civil war.
Something similar could be done with the Carlists in the Nationalist side, maybe.
What if the CNT/FAI (Regional Council Defense of Aragon) starts as a "puppet" of the Spanish Republic? Of course, the Republic would lose control of their territory (and factories and troops), but the Anarchists will still fight the Nationalists as allies in a war, but not the Republicans, and take territory for themselves ("expanding the Anarcho-Synicalist Revolution" through Spain), although maybe there should me a modifier to make them deny any kind of land occupation request... If not, they could instead appear as an ally within the same facion (similar to the United Chinese Front, but considerably smaller)
...HOWEVER...
...The master-puppet (or ally) relationship would break once the Soviet influence is too heavy, and then you will have the civil war between them. It could happend before the Nationalists are defeated (if the war goes well) or before, thus unleashing the three sided civil war.
Something similar could be done with the Carlists in the Nationalist side, maybe.