Ok, how about this, does anyone see anything wrong with the following belt and suspenders approach. Use the remote cylinder mounted as above where the brake cable pushes/pulls the lever that actuates the piston. Either have the same cable continue on through the lever and with the same action, i.e. same pull of the cable that actuates the lock, also actuate the mechanical caliper on say the TSM split case disk setup. My mechanic suggested another option would be to have a separate cable come off the back side of the same lever on the bracket, i.e. instead of the same cable actuating both mechanisms, directly, have the parking brake lever pull the piston and the caliper mechanically through the lever.
Why do both? If you have to register the vehicle and pass inspection in an area that doesn´t permit hydraulic brakes as your only parking brake and in order to pass inspection the brakes have to hold the vehicle. Neither of the current disk based systems has a good rep for holding the rig, i.e. passing inspection. A dual system would have the benefit of holding the vehicle and if it failed the disk would be there as a back up. I guess the second aspect is that it will take a while to work out a stronger single caliper or dual caliper setup so I guess you could say that the linelock is cheap backup untill the dust settles on the caliper debate. What do you guys think.