Johnny has also worked on two films at once
I don't know the exact logistics, but roughly, he worked on Chocolat in about June-July of 2000, and on From Hell from around June-Sept (and going straight on to the ill-fated The Man Who Killed Don Quixote right after that!) In Chocolat, Johnny wore his natural long hair in a ponytail, and in From Hell he wore a (shorter) wig, because the latter film took place in Victorian England. He was the lead in From Hell, but only 4th or 5th billed in Chocolat, so not being the lead in both films probably helped him to manage to do both simultaneously.
He also did a cameo for a French film, Happily Ever After, while he was in the middle of filming Secret Window. That might've only taken a day or so, though.
I think that Christian Bale was working on something else (Terminator?? I forget) during part of Public Enemies filming, but he wasn't required to be present for the whole ~4 month Public Enemies shoot.
As for Eva, I'm sure they will figure out how to fit in the two shooting schedules, otherwise I don't think they would offer her the part! Unless Angelique is in every scene, they can film other scenes around her other schedule.
I'm not paying attention to most of the crew's names as you're posting them, MB, but I appreciate you posting the info anyway, because as you say, it's just cool in general to see the project shaping up and various different positions getting filled!
Cathy