I think I know what you mean - I guess it is the 'clearing the throat' type sound - could be spelled 'hhccrrr'??? making 'roulez' sound almost, but not quite, like 'hcruel-eh'. Perhaps a sound akin to the celtic 'ch' as in loch followed by the 'r'?
I'll give it a whirl anyway - Can't be any worse than some of the Lancashire pub singers I have heard doing county and western music;-)
D the G