Sorry to disagree respected brother. As much as 10 to 15% of transmission time in the sectors that I do is spent correcting wrong freq/channel readbacks. "jetfresh" suggestion has some merit.......precedent....military aircraft often use a pre-set "stud" system for regular use; although this would not work in the wider world.......but replacing 6-number values with a 3-number and/or letter combination would be a start.
Would have to be done via ICAO probably.....so no action for at least quarter of a century!