i would avoid those first two. i considered the same thing you're thinking of. the problem with those two is that theres no secure way to suspend it while you're moving a. it, or b. the freezer. you could just wrap the line on a cleat, but still, what if it falls. the come along (option #2) would allow you to raise it, but bringing it down safely would be an issue. i believe those things just unlatch to release tension, basically dropping the keg. manual chain hoists seem to be the cheapest and safest option.
