I think most teams would want Rafaela over Duran, due to his low salary, especially in the front end, and 6 years of control to 3 for Duran. He plays way better defense and at a tougher position. He might improve on offense, where Duran might decline in the next 3 years.
Rafaela vs Abreu is a tougher call. Abreu plays great defense at an equally challenging OF position and has the power this team cannot afford to part with. Abreu has one pre-arb year left and 3 arbs to follow. He may end up being cheaper than Ceddanne over the next 4 years, and CR has a back-loaded contract, so many poorer teams would likely trade him after 3-4 years. Rafaela makes $10.5M in '30 and then $13M in '31 with a $16M option w $4M buyout. That does not seem like an overpay, but many teams would trade him at that price.
The presence of K Campbell and even Yoshida as a short/corner OF'er option makes trading an OF'er a must, to me, this winter. There are arguments to keep one over the other, but one should be traded. To me, they all look pretty close to even, when you factor pay, years of control, defense, offense, power and speed, so I'd trade the one who brings back the better return.
Unless we get a big bat upgrade at 2B/3B, I'd hesitate to trade Duran or Abreu, so to me, this context is what decides who I'd want to trade. If we get a big bat, I'd lean towards trading Duran. If we don't, it's clearly Rafaela, IMO.
I'm far from giving up on K Campbell, and I think we can "hide him" in LF, if his defense sucks. I have little doubt that his hit tool is a plus. I know many here cringe at the idea of Masa in LF, and I don't like the idea either, but I think Brez & Co are not afraid to play him there. If Casas comes back to form, we could easily platoon Campbell and Masa in LF and DH Casas, if there was a major OF injury. These are risks worth taking to fill that 2B/3B need.
Counting on signing Bregman or Bichette long term is not likely.