I've been places where they used wire rope pullers for what you describe. They anchored the puller to the overhead structure and slipped the puller around the cable and then released tension on the hoist until the puller grabbed. My concern is you don't have any back-up safety to hold the load in case your one cable fails. Maybe some kind of floor jack or second lift point would suffice You should of course read and understand all safety requirements for the equipment you are using and follow the manufacturers instructions.