THink I would get a cable come along and put one end to tractor chassis at rear , and other end on FEL framework just above unseated pin and apply brute force... May cautiously exercise lift/drop function of FEL during process....
Other option may be to park tractor near a stout tree and placed so you can get a comealong on lift arm and around tree (at 90 Degrees) and apply some sideways leverage...
ITs probably under tension and ready to pop back into place you just need to tease it a bit...