ULA is one thing, they are highly successful and established. Starliner is a lemon. I think it would be better for them to develop a capsule based on their own New Shepard vehicle.
Rejigging New Shepard with appropriate docking, heat shielding, maneuvering thrusters, life support, power, cooling, etc, etc, etc, is a huge project. Certainly it's a head start, but I think it'd be a ground-up redesign with that as experience and maybe a starting point for beefed-up parts.