You do not apply for your major until sophomore year. Kenan-Flagler and the Gillings School of Global Public Health are very competitive and not guaranteed.
If you are accepted off the WL you would likely not get your first choice dorm and would need to take what is available.
Same goes for classes. My D chose her classes at orientation. They save spots for all orientation dates so that accepted students are not shut out. Not sure how this applies to WL students, whether they have spots available for orientation etc.
My D graduated already but did not know anybody who was accepted off the WL.
Coming off the WL means you are behind before even starting- part of orientation involved meetings on getting involved in research, etc., Isn’t it better to attend the school that loves you and start the semester like a rock star? I would develop roots at my school and if UNC admits you, take the time to ask a lot of questions about dorms, classes etc.
UNC is a great school, but there are many great schools.