So, pretty sure Luke would make this offer after they kick each other's ass in the battle royale, but... would Rey want to do like... a mutual training thing together with Luke? Granted, he doesn't have the knowledge his old self does, but he has some Actual Training that he barely gave her in canon. Not only that, but she has knowledge and a perspective on things that he could learn from as well.

Basically I think it would be fun if they could be friends and learn from each other.