There's a previous discussion on undergrad conducting here
Undergraduate Orchestral Conducting
It's probably a tougher field to break into than trying to win an orchestral chair. Serious preprofessional study can be at the grad level or in the form of a GPD (graduate professional diploma, often AFTER an MM), an AD (artists diploma, in lieu of or in addition to an MM), at one of the few internship/training orchestras, or being taken under the wing of an established conductor.
I would suggest talking to as many current or recent grads of the programs that interest you, and pick their brains as to backgrounds, how they got there, formal/informal training, etc. The schools should be able to provide names of current/former students willing to share their experience with you. Try and establish a dialog as well with a few of the department heads at the schools that you will apply to and get their overviews as well.
You will need all of the skills you mention in your opening post, a tremendous talent and quite a bit of luck, and exposure. There are also a few competitive summer programs/festivals that would enable you to hone experience and develop skills.
Good luck.