Carter is staying by all accounts and Nakarawa is signed as a back row predominantly. Ulster's back row is looking more healthy than it has in years but I'd still say Leinster have more back rows than they can give game time to, so I wouldn't be surprised to see a Leinster back row like Conan or Deegan look northwards.
Ye are clearly struggling for hookers though and all of Ulster's options there are really good. We have too many up here so how about a swap of a hooker for a BR?