If you want them to look beyond Analysis, would an intro to discrete math maybe be what you're looking at?

Discrete Math With Ducks[0] (and the professor that taught from it) is the reason I focused on the discrete side of things. It doesn't take itself too seriously, and it introduces a range of topics in the area. Plus the mindset is different from analysis. It's an interesting shift

[0] https://www.maa.org/press/maa-reviews/discrete-mathematics-w...