Another option would be a
suspension stem; they are cheaper, lighter, and easy to adapt to any bike
In the early 90s, there were two philosophies on MTB suspension: "suspend the rider" (susp stem) or "suspend the bike" (susp fork). "Suspend the bike" won out due to increased traction, but suspension stems do provide comfort. Suspension stems are slowly being marketed again for road and gravel use where weight, complexity, and stack height are important; and traction is not.