If you have the equipment for the landmine variation of the split squat that is a great way to add a lot of weight safely. Some climbers with very strong legs find it hard to get enough weight on their backs for the box step in the Max strength phase of training. This wold be a good substitute.
It wouldn’t be a bad way to do ME for the strong athlete either if you need say 80+ pounds on your back for ME. I have had some athletes needing that much or more to get the ME effect.
Good call on your part to come up with this.