Consulting major has the requirement of 21 credits. Only one possible overlap with Finance (G345). If you are good enough to get into the workshop, you need to take three more courses.
http://kelley.iu.edu/BEPP/Undergraduate/page14136.html
Therefore, you do need to plan very carefully. Kelley added five required courses such as T175, T275, T375, D270, D271 in the last two years. All these should be electives. If you are interested in a minor outside Kelley, rush a fraternity, and take a few extra interesting courses inside or outside of Kelley, you are out of luck unless you bring in 20 credit hours or more to IUB. You should take some summer courses and get the credits for W131, M118, M119, E201, etc. I believe that the consulting workshop students have higher average GPA than the IBW members. So, keep your grades up.
The Kelley Consulting workshop and IBW info can be found from the link below: