Would omitting the leading "1" help
One problem with this practise is that a VHF frequency suddenly becomes very much like a pressure setting expressed in inches (which many use)
"Two nine decimal two five"... frequency or pressure setting?
Sure the practice of reading all six figures would resolve that point... but surely THAT is the point!!!
Why would you confuse it with a pressure setting or anything else for that matter?
"Contact London Control 27 decimal 430"