I would just try to do some natural glut ham raises (Thib wrote about them in “The Painful Seven”). No equipment needed. IMO a much harder exercise. If they are too difficult then you can buy a big rubber band and use that to assist you.
I have this one from Yukon Fitness. It is slightly modified to meet my needs. I cut the lower bar so that it does not stick past the hip pad. I have raised it off the ground about a foot and added weight to the back of it so that it does not flip over on me.
I have done hyperextensions with a 300lb barbell and side bends with 100lbs. I have not actually used it for GHR.
I have had it about two years and it has held up well.