Glute Ham Raise replacement

i saw a video awhile back of this guy hanging upside down from his ankles. He was completely extended straight down, and would use his hamstrings to lift himself into a squat position.

If you had a partner to spot you and an apparatus with a secure hold on your ankles, would this be an ideal hamstring exercise? (although very difficult) I feel like it takes away the “fulcrum” that traditional hamstring exercises negatively incorporate. Or at least moves that fulcrum from your knee down to your ankle. what do you think?

thanks