Study IE and double major in Econ. Decent grades will almost ensure a banking job at one of the big boys (GS, MS, JPMC). I majored in ChE and had almost zero business experience but I still managed to get an i-banking interview and also made it to the Super Saturday at a PE firm in Chicago (bummer that I didn’t get this offer). The opportunities and offers will be there is all I’m saying.
Also, there is always the option of the MMSS program, although it is considered one of the hardest majors on campus (along with ChE, but I’m biased lol). Just keep in mind that with the MMSS program you’ll be competing for grades with some of the hardest working kids at the school. I wouldn’t necessarily say MMSS program majors are the raw intelligence “smartest” kids on campus, but everyone I knew in that program absolutely worked their balls and ovaries off like they were robots. The kids I knew in MMSS all got prestigious jobs and graduate school admissions though.
As for the co-op program, that is very much engineering/technical focused, so that probably wouldn’t be a good path based on your goals. As well, if you double major in IE and Econ I am not sure how realistic it would be to also obtain a Kellogg certificate, but I might be wrong.