They're mutually exclusive, so you're never going to get all three trees, and the policy's only effect is to unlock the other tree, which means it's pretty expensive. Basically, this creates a bunch of blended ideologies, where the core ideals are modified / contaminated by something else. It also positions you partway towards that ideology in terms of influence mechanics, which means that sometimes you might want to hybridize your ideology as a nod towards the dominant one in a bid to reduce unhappiness caused by the desire for a new ideology.
Proposed names for these policies:
- Freedom -> Order: Socialism
- Freedom -> Autocracy: Authoritarianism
- Order -> Freedom: Popular Movement
- Order -> Autocracy: Leader Cult
- Autocracy -> Freedom: National Democracy
- Autocracy -> Order: Fascism
Of course all of those ideology names are simplistic, but so were the original ones. Thoughts? Might be a fun mod, but probably hard to make. And it might mess up balance, as there might be policy combos from different trees that are too powerful.