Yup, I figured that out. Still, if the trigger location is moved a couple of feet down the hall, it would prevent future players from getting in the same situation.
Same issue here. It is only possible to select un-slotted enchantments from your inventory. Confirmed that un-slotting an enchantment will allow you to refine the enchantment. Tried on multiple characters, on multiple items. All items enchanted post Module 2 release.