Decanter As far as I can tell, all of Esmera's dialogue is accessible in different routes. She has unique dialogue after the unity vote if you double deal but it is pretty similar to if you just don't keep your promise of arguing for alternate forms of unity (she isn't really angry, says she will be a bit mistrustful in the future but mechanically it plays the same, maybe it is only meant to reflect the loss of Esmera score that occurs when she realizes you dealed with both of them).
Esmera will only actually get angry dialogue during the Unpeople vote if Simon owes her a favor for getting her to flip on the schism vs new religion vote and still refuses to do what she asks, at which point [Esmera Deal] gets toggled off and from then on she treats Simon coldly as if they never had agreed to deal with each other in the first place.
Kerannii on the other hand gets dialogue strongly condemning Simon for double dealing if you talk with her in her chambers after the first day's votes, but because [Kerannii Deal] doesn't get toggled off she goes back to being super friendly during the minor issues votes and the aram-eustrin conference and doesn't use her hostile dialogue, instead blessing Simon's heart and doing favors for him.