My Fenn XT does not have a rear handle, so I used two NSI rubber plate with sewn in spectra loop. The orange rope with metal eyelets ties the two rubber plates together.
Purpose for this set-up.
Orange rope with slippery metal eyelet evenly splits the load between both plate in all directions.
If one plate comes off, the middle ring is small enough that the rope cannot slip thru.
Sewn a piece of neoprene (mouse pad) on middle ring to eliminate scratching the gel coat.
Harness is anchored to the back of the boat so boat will rotate and not get hit on the side by the wave.
I would not expect forces to be huge if boat is pointed into the wave.
I have not tested this out in serious conditions, but it does feel sturdy. NSI do sell adhesive footstrap pad. Think two of those would be impossible to tear off.
Downside:
The setup is heavier compared to leg strap. You feel it when carrying the boat.
The long bungee can get wrapped around the rudder when you are in the water.
Upside:
Leash does get completely out of the way. You can get into the water and swim around or dive down to look at the fish.