I dont know exactly what people expect to get out of players like Taillon or Happ. Taillon has 2.5 years left under contract and while he's making a reasonable $17M AAV, he hasnt even lived up to that AAV in his first 1.5 years of the deal. Happ has the same 2.5 years left and outperforms his AAV by a little, but not a whole lot. Then you have to find a team he would wave the NTC for and find something that team has that you like that's willing to give up on a 3 fWAR player on a reasonable deal and its most likely going to be a player thats years away because a Happ isn't the type of player thats going to attract near MLB ready prospects, at least not ones that you would hope match his production.
It's Bellinger and Hoerner, imo. Hoerner is legitimately the only player this team could move and make any kind of organizational shift. If you eat all of Bellinger's remaining 2024 salary and talking to the Yankees, since they seem interested and need 1B/CF, you are probably only looking at something like Clayton Beeter + Agustin Ramirez. The rest are just marginal moves from our "depth" of pitching.