A Contagonist might be a charming and exciting way to go. I just saw The Accountant, and I thought of your post. First off, The Accountant reminded me of A Man for All Seasons in that I was left with a rare aha sigh in it coming together. I guess if they get a linear MC right, it's a slam dunk. However, this movie was a flipped version of Man for All Season's storyform, somewhere, and it really worked. What is very interesting, it appears they did the opposite with the contagonists,
Man had the contagonist in the face for the whole film and Accountant had an end reveal, imho. The emotional scenes at the end of the last action scene is probably what you are looking for, where the mc/protagonist casually winds up his protagonist goal, with the ic off stage somewhere doing the ic thing (whatever it is in the movie), YET the mc/protagonist is in one of the most fantastic and satisfying emotional confrontations in the history of film and storytelling in any form, including print...and it appears to be with the contagonist.
I can see the contagonist romantic going hinder-see me, hinder-see me, the protagonist does the goal at the same time finally noticing, what? me? all this time you've been interested in me?