There are lategame ideas and forms of government that give you decent CBs on everyone. You get Imperialism, which takes territory from anyone at half cost, and Revolution and Counter Revolution, which takes land at 25% cost. Be warned that while Imperialism can show up around 1650, Rev/CounterRev won't show up until ~1750. It's a lategame thing.
Before 1650, the papacy is still strong, so if you become papal controller, you can excommunicate the French king, which in turn gets you a CB.
Across pretty much the entire game, if you take the Bill of Rights NI, you get a CB called Liberation, which lets you free states for huge amounts of prestige. On the other hand, it's not very good for taking territory.
You can get called in to fight against them without a CB, either by warning them, or guaranteeing their likely targets, and still not take the stab hit.