I have tried playing as various countries, but with each of them, I get random crashes after a while. When I reload the latest autosave, I can usually continue for several more years, past the date where I got the crash, so it's not tied to a specific in-game date. I assume it is some random event firing, or something like that.

So far, I've tried playing as Ovdal Kanzad, Chaingrasper, Dirtwater and Severed Ear, and I got crashes in all these games.

I have all the main DLCs and nearly none of the cosmetic ones. Anbennar is the only mod I have active. Local files are 100% intact, according to Steam.

What information would help you figure out what's causing the crashes? I haven't seen anything suspicious in game.log, and hundreds of suspicious lines in error.log (lot of unknown values, event targets or whatnot in that log, but those all appear very rapidly even when the game is not crashing).