I am specifically talking about the moment before final battle with Harry, after Neville chops Nagini in half. In the beginning of Deathly Hallows, Hermione says that remorse can put the soul back together from horcruxes.
Is this still true once some of the horcruxes are already destroyed? At the end Harry does tell Voldemort to try and feel some remorse, but that only seems to be a taunt, and not actually an invitation to try and make things right.
If Voldemort had wanted, could he have put his soul back together through remorse just before his fight with Harry in Deathly Hallows, or was this avenue for soul repairing closed for Voldemort once the diary was destroyed in The Chamber of Secrets?