We had a US registered corporate jet fly in to Bali a few weeks ago with US crew and quite frankly no-one could understand their non-standard radio phraseology. He said something like 'on descent passing 20 point 1 down to 10' .. ATC and others on frequency like myself were wondering what the hell was he on about? And after landing and being told to contact ground on one one eight decimal eight, he goes off rattling on about not being able to contact 'eleven eighty eight eight.' Apparently he dialled up 118.88 and not 118.8 as directed
.. Standard phraseology is already out there, but as the saying goes, you can lead a horse to water but you can't make it drink.