My first reaction was also that this was just too many notes, and use a simpler technichord.

A pianist would probably double the melody with the left hand an octave lower (Eg: from the top: C, A, G, E with the right and lower C with the left)

This has been referred to as a kind of "locked hands" technique. Some people describe Shearing's sound as that kind of technique, but of course all the notes in the middle of his chords are superbly judged.

There is a kind of "ham fisted" technique to play octaves with chorded notes in between, where you play pretty much anything with your knuckles, but I've only heard of this done on Hammond Organ.

A very good friend of mine who is a superb musician met George Shearing once and found out that he was a great admirer of Delius.

Now there are some chords to think about!