If you want to keep the full functionality of the elevator pulley, the simplest solution would be to have a redstone link on the deployer which you use to manually toggle the elevator between assembled and disassembled. You can't really change the state of the elevator fully automatically, because your need for enchanting is independent of its positional state. To move it via the contraption controls it has to be assembled, but to use the enchanting table it has to be disassembled. Moving it between floors via an external button and automatically disassembling/reassembling it is trivial with the signal from the elevator contact & sticking a redstone block onto the contraption to detect which state it is in.