I think flat 200 raise for the rest of the crew and allies for taking down a Yonko is the right call. That puts them at
Nami- 266 million
Ussop- 400 million
Chopper- 200 million
Robin- 330 million
Franky- 294 million
Brook- 283 million
Luffy I think is a cert to double his and get 3 billion.
I'm a bit uncertain about Zoro, Sanji and Jinbei. I don't think their bounties will be as high as the Calamities even after this arc- in the same way Luffy won't be higher than Kaido, and I doubt the others generally will be above the Numbers/Tobi Rokko (Ussop and Robin might edge out some of them). Zoro might get just over a billion (1.02 would be his usual multiple of 6 bounty pattern, 1.2 billion at the absolute most), but I don't think he'd be dramatically over that. He's the hardest one to predict because Oda's not gave us Rayleigh or Mihawk's bounty. Even the other four YC1's could give us more of a hint. We don't know where he's roughly going to top out in the end, unlike Luffy (and this effects Sanji and Jinbei to a lesser effect) and that means we don't know what would be too a high a raise for this arc. I could see Sanji getting 999 million because that's the sort of thing that would really annoy him, and it's an unwritten rule that Sanji must always be annoyed by his bounty. And Jinbei could double his and get ~880.
There's not many bounty raises left in the series, and after this Luffy will be considered a great pirate and be ready to meet Shanks. I think those numbers are nice middle of the road Yonko crew bounties. After Elbaf maybe Luffy rises another billion, Ussop definitely hits a billion, the others hard to say.