Unless you have abused the he'll out of your yeast, there is no finings agent on the planet that will take so much of out that you wont be able to naturally condition your beer.the finings manufacturers might wish it was that good... But it isn't.
OK - if you are conditioning some super high gravity thing you might want to re-pitch some more yeast... But that's about health not cell count.
Isinglass and biofine are bopth used for cask conditioned real ales, which by definition are naturally carbonated. He'll... I filter my beer through a 1 micron absolute filter and it still let's enough yeast through to be able to naturally carbonate... Yes I know yeast cells are bigger than 1 micron... But nonetheless it works. Very very bright, Post filtered beer, still manages to naturally carbonate. So I seriously doubt that any finings agent will give you trouble on that front.
Me, I fine with gelatin and any damn vegans who come to my house can bring their own damn beer.
TB


