Homer Kelley recommended the Zero #3 procedure for Chipping, i.e., putting the Club in-line (horizontally) from Left Shoulder to Clubhead.
In January 1982, I snapped a down-the-line photo of him in the converted garage outside his home in Seattle. There were no automobiles in this garage...at least not in this half.. it had long since become his dedicated Golfing Laboratory. In the photo, Homer is standing inside his Inclined Plane -- the same one in the book -- and is clearly gripping the Club in the cup of the Left Hand, one of three ways to Zero the #3 Accumulator.
I'll see if I can't dig that photo out, scan it in and put it up for all to see.
Meanwhile, experiment with using the Reverse Overlap Grip (10-1-C) to get this job done. You may find that the extended Left Forefinger makes it a bit easier to locate the Club in the lifeline of the Left Hand. It may also feel more secure (especially until the necessary hand strength and grip pressures have been developed).
For the record, Homer used the standard Overlapping Basic Grip (10-1-A) in the Strong Single Action Variation (10-2-B). Why didn't he use the Reverse Overlap?
"What do I need with another grip? One is hard enough to learn!"
Wonder if Yoda ever located this photo of Homer? I'd love to see it.