I used to do 10 gallon BIAB. I made my drawstring with 4 loops, put these loops over a clevis hook that was on a long rope and used a pulley attached to an overhead tree branch to hoist it out then tied it off to an eyebolt in a fence post. At 20 some lb of grain + water absorption I was always worried something was gonna give and I never was too comfortable standing next to it. Then I straddled some perforated metal across the top of the kettle so you lower the bag onto that to take the weight off the bag, rope, hooks, pulley, etc. If anything gives it will likely hurt both you and your equipment.
By the way, I have never heard anyone say, I should have bought a smaller kettle. Just make sure you have the BTU's to match it.