I have in the recent past replaced two calipers on a non Morgan ABS system. I crimped the brake hoses on removal of the calipers and on caliper replacement I removed the cap from the master cylinder, I did not touch the brake pedal at any time until the bleeding was finished, Having loosened each of the bleed valves in turn, gravity seemed to perform the bleeding task rather well, leaving no evidence of air in the system or brake imbalance. All that typed inclines me to suspect bleeding a clutch by similar method may well be possible..?