How's this for a thought, get some 6-8 inch long bolts or threaded rod. Take the two bolts on the top of tranmission out and replace with the threaded rod/longer bolts. Then remove the bottom bolts and slide transmission back out of the way, replace the clutch and slide transmission back in place. You can always place a 2x4 under the back of transmission to help support it while changing the clutch.
