Yeah, it wold need to be very brief, and for the noble sacrifice to remain strong he shouldn’t ask for Rey’s forgiveness. I think some ‘Rey!’ and ‘No!’ would work while he’s crawling toward her, just to indicate that he’s vocalizing more in this scene, then have one brief line after she comes back to life. I’m thinking in order to tie it into his character and maybe provide some closure to his ‘I will finish what Vader started’ bit, have him say ‘It’s finished’ or ‘It’s done’ right before she says ‘Ben’.

Having this note of vague finality before he dies might also help to offset the awkwardness of his abrupt death.