The Arcane Archer and Circle of the Cresent archetypes make this purchase worth its sale price. Other archetypes would need to be balanced for use in your own campaign worlds, but are a good starting point.

Beautiful idea. I love the Battle Master style but flavored enough for the Bard. Adding the feat at the end was a nice touch, too.

I would not allow a player to take Hasten Tempo but that's only because I enjoy the fact that players cannot hold their action in 5th ed, which means I don't have to adjust the initative once its calculated. Every other conducting technique is really unique and flavorful. Sprint is my favorite, personally.