He's an unabashed imperialist and dedicated to Orlesian supremacy. He may be willing to be charitable to lessers on his own terms, but would never allow them to be equal, or give any hope of autonomy to the Dales. In any case, reuniting Celene and Briala is the only way for the book to not suck, or at least to have one of its worst aspects removed.
I don't see it happening. Celene's sins are great and numerous. She murdered Briala's parents to get the throne and then lied about it for years. While she obviously does care about improving the lot of elves, seeing them as Orlesians first and elves second, she still sees them as elves and demonstrates a willingness and intent to sacrifice them to the altar of politics and Orlesian security. She repeatedly tells Briala that she will do everything she can for the Elves, then plans to keep them under her thumb for use as Eluvian assassins. Then, possibly as hurtful as anything on a personal level, Celene instantly and unthinkingly risks her life to save Michel, and later in the same fight lets Briala (almost) die when she could have intervened.
Is there some love there? Sure. Also a lot of unhealthy dependence. Celene obviously cares about Briala as an individual, but admits her commitment to Elven equality is flexible, and entirely dependent on a cost/benefit analysis.
The entire reason Briala steals the Eluvian network from Celene and directly prevents the Empress from stopping the Civil War before it goes any further by dumping her as far from Val Royeaux as possible (and in Gaspard held territory,mot boot) is because she knows without ambiguity or doubt that Celene can not be trusted.
I don't see how distrust, betrayal and completely incompatible goals make for a good foundation to repair a failed relationship.