I question the extent to which the two goals have to be juggled in any case, since he already knows how to kill Dementors, and isn’t willing to throw his life away to destroy them, which would be the main conflict. Destroying the Dementors is now a tactical issue that need only concern him when playing politics, so the only way it interferes with his transhumanist goals is if his politicking interferes with his research more-so than it would have if he weren’t doing it with Dementor destruction in mind.
I question the extent to which the two goals have to be juggled in any case, since he already knows how to kill Dementors, and isn’t willing to throw his life away to destroy them, which would be the main conflict. Destroying the Dementors is now a tactical issue that need only concern him when playing politics, so the only way it interferes with his transhumanist goals is if his politicking interferes with his research more-so than it would have if he weren’t doing it with Dementor destruction in mind.