The background is already blurry, I just added a bit more to better match Rey’s. Here’s a frame comparison:
https://imgsli.com/Mzc1MDg

And here’s a new version with a more cleaned up mask:
https://vimeo.com/500257444

I did cut out a few frames at the end from Rey’s footage, but I think only having Rey’s hovering head in the back would be awkward, I like the way the shot frames all three characters (Finn, Rey & BB-8) before Han say’s “fugitives, huh?”.

At the beginning of the shot the attention is on Finn, who’s in focus in the center of the frame, then as Rey walks in the background she slowly pulls the attention, and before she comes into focus we cut to Han. Han’s actually looking up at Rey when he says “fugitives, huh?”, which is why I felt the edit made it feel like she teleports into place. With this version we’re also looking up at Rey at that moment so it feels natural.