I'll give this a try. I've also come across the 3 point grip. Planning on giving that a go too.… something else to consider: rather than holding the rod with the reel “under” the handle/grip; turn the reel out to the side.
I pick up the rod thumb on top, reel under; then rotate my wrist so the “fork” between thumb and forefinger is uppermost … probably about a 45-60° turn.
I find this does at least two beneficial things: it restricts the articulation of the wrist joint; it removes some of the mass of the reel which can cause the wrist to flex excessively
Let me know how you get on, Andrew
So that's my next practice session sorted.