If part of the cost of re-signing Semien is moving Bo from Short, then I'm even less interested than I was before. Semien is (likely) better right now, but he's 31, and Bo is 23, so I expect Bo to improve, and Semien to decline going forward. I really think you give Semien a qualifying offer, and a reasonable extension offer to stay at 2B. In the likely event he doesn't take it, you take your draft pick compensation and thank him for the great season.
Ray is EASILY the more important extension candidate, IMO.