Sure you could tow it backwards with a wheel lift. Sight additional strain might be applied to front end components. It still would be better if you could extract the axel yourself. What have you tried?

I am thinking that if any torque twist of splines has occured it might be an expensive repair at garages. You on the other hand could use used parts if required to repair whatever is found. In the cost equation would you be further ahead to get another rear end from a salvage yard and change it? More likely the axle spline is just stuck and needs real pressure applied somehow.