I found a glitch which allows you to start the Spellbook Salavge (getting Hex's spellbook) quest early.

Do the All Aliens Glitch, but when you enter in for the second time, hold Up-Left and spam interact and the third alien slot.

Video showing it off:

https://drive.google.com/file/d/1MdUeeZUk7Lq_goXBQcvvc-MGRrIcDbW0/view