I am currently in the first few years of my undergraduate career completing a major in Computer Science. Although I do not enjoy the subject, I fully plan to see this degree to completion because it realistically assures me a stable, well-paying job. However, I am very passionate about comparative literature. I have spoken to some of my comp lit professors and they advise me to continue my CS degree as a "back-up" but take as many literature classes as possible as extracurricular and do well in them. The plan would be to apply to relevant Master's program and a PhD program after that if I wish to continue. Is this the best approach?
The general question I am asking is how feasible is acceptance into a graduate school in a subject completely different than my undergrad (such as CS -> comparative literature) under the best possible circumstances, and what can I do in the next few years to increase my chances at admission?
Another more specific option I am wondering about, although this may not be the place to ask, is my university offers co-terminal programs that achieve a BS and MA in 5 years, but comparative literature is not offered as a co-term option. The closest are Philosophy or English. Would pursuing either of these alongside a BS in CS be beneficial when being considered for admission into a comparative literature PhD program? Another option would be to pursue a minor in Comparative Literature.