I've been thinking about this a lot lately as well and agree with much of what you said @Aristotelian, Holliday likely 2-3 years away, so in meantime Urias + Henderson + Westburg + Mateo + Vavra would be a fine group to have occupy 2B, 3B, SS, partial DH and PR/PH. Every quality playoff team needs a guy who can come off the bench and get a SB and I think Mateo can fill that role nicely and platoon a bit.
Mateo is with the team from through the 2025 season, Urias through 2026, Vavra I believe through 2027 or 2028, and Henderson/Westburg unless called up soon are through 2028. Gotta figure Holliday is through 2030 at least. Seems like having most of these pieces isn't a bad thing for a contending team. If you can package one plus another prospect/player for a #1/#2 starter controllable then it'd certainly have to be considered.