Beyond the sake of “shipping”, I think playing up the potential Finn/Poe chemistry would be a good way to recontextualize Finn’s “I never told you” subplot that is never really resolved.

Have Finn call out to Poe instead of Rey in the sinking fields. “Poe, I never told you!”
Rey asks Finn what he was going to tell him instead of her.
When Finn and Poe are about to be executed, Poe asks, "So what were you going to tell me?"
At the end, Poe gives Finn the flirty look instead of Zorri.

I’m sure more little hints could be added beyond these. And although we don’t get a kiss, and I think there is enough there for adults to understand, at least. Since we never see on screen Rey learning about Finn’s force sensitivity, I think implying instead that Finn has feelings for Poe could work as an interesting alternative that could actually have some semblance of a payoff.