It would have to be a team with a young MLB SS playing out of position, or a team with a SS prospect ready to go in 2026 that's blocked by a current MLB SS, or a 3 team trade where another seller sends their MLB SS in exchange for prospects from the 3rd team.
So yes, there's a very narrow band of possibilities, which is why it's unlikely to happen. But the Rays and Cards and Padres have the ammo to make it happen if they wanted to fix their catching position, and I think the Rays are the most likely to do it. Murphy just seems like a guy they would love.