Is Catalan/Basque separatism still a thing, in the sense of violent outcomes (a la ETA)? I have the impression that it's become a fairly civil process (more along the lines of the Scottish or Bavarian independence movements)

Catalan separatism was never violent and the Basques concluded peace with Madrid, which holds. So it is all political.

Several Catalan politicians were prosecuted for holding an "illegal referendum" and had to hide in Belgium for some time.

I think when we want to get rid of violence to change borders (war), we must allow borders to be changed peacefully.