I have often thought about the small bearing surface that some seatpost clamps have for the saddle rails, and wonder if a very small cro-mo or alloy 2-part 'shim' in the shape of a half-circle tube, super thin, and about the size of the saddle rail, sandwiched on both the top and bottom of the rails in between the seatpost clamp, could alleviate those stress riser points. Would weigh next to nothing, and help distribute the load across the rail.

I looked and saw nothing like this, but if I ever get a ti-railed saddle, I'm going to fab some up just for extra insurance.