Pelz was popular for a long time with a 4 wedge system.
Essentially it went like this.
3 different swing lengths with 3 different grip lengths and 4 different clubs.
Half swing, 3/4 swings, and full swings.
Grip the end of the club, grip the middle of the grip, grip all the way to the shaft.
This essentially gave you 36 different distances that you could hit consistently.
Not a bad strategy. All you have to do is practice and measure.
If you can manage to get more precise with your swing length, IE: Half, 3/5ths, 4/5ths, full then you could be even more precise with your yardages. But that means tour level practice schedules.
The thing I always struggled with in Pelz' wedge system was the assumption that you would find a consistent yardage for each permutation of wedge and swing. But once you factor in the varying loft and roll of different clubs and swings, I think that consistency is liable to break down. E.g. a quarter swing with a 50* wedge might go an average of 40 yards. But give yourself a downwind, or uphill, or onto a baked out green situation and even if your ballflight is perfectly consistent, you're going to be making pretty significant adjustments for run out. Your 40 yard wedge/swing combination might easily go 60 yds. To me, you're really thrown back on your native judgement and I'm not convinced that you aren't better off learning to judge distance and roll more intuitively with just the one wedge (AKA Utley and others...)
Also, Pelz made a big thing out of having different bounce configurations on each of 4 wedges in your bag to suit different conditions. But then you've got to ask yourself whether you still have 4 wedges to choose from on any particular shot.
Lastly, Pelz describes, but kind of skates over (in my opinion) the way in which his wedge system evolved. He had tour pros hitting hundreds of wedge shots to nominated distances - and eventually he claims 2 things spantaneously happened (1) each pro developed a passive hands swing and (2) each pro would find 2 or 3 yardages with each wedge that were really consistent. As a way of learning, that sounds great. But I think it's a heck of a leap to
tell students to keep their hands out of the swing and then to measure off the average of their 1/4, 1/2 and 3/4 swings with each club. I wouldn't assume that you'd get the same results at all.
There's good stuff in Pelz for sure, but it's hardly the bible...