Hi there, and welcome to the Cafe! Great to see a new face around here
As for your Sale situation, there's no way on this planet I'd give sale for that combo - you need a much better bat to justify sending one of the hottest pitchers in the league. I know he had a bummer start last time out and walked a couple too many guys, but he was one out away from getting out of trouble and his teammates didn't do him any favors. I think he's far and away the best player in the original deal, and at his young age and with his upside he's not the kind of guy you want to let go for two slightly above-replacement-level guys like Joyce/Niese.
Now, as for the second part of your question, yeah I'd absolutely give sale for Jennings or Upton straight up, but that's never going to happen - probably going to take a package deal where you send a serviceable batter and Sale for one of those guys, and even then it'll probably take the right kind of deal. I think I'd probably not do Choo for Sale, and I'm still a Choo believer, but it sounds like you have some rebuilding ahead of you, and I wouldn't do that with a 31-year-old OF who's nearing the top of his hill, best case.
Hope this helps