These aren't cliches, they're crutches. They are things that uninspired, unprepared air people use to help them get to the next element.
Step outside the confining little box called "radio" and just monitor the human race. Phone calls from your kin folks... listen to WHAT they say (sometimes over and over!) "I just wanted to touch base with you."
Car salesmen. In some dealerships you may find an available seating to read a magazine or book up near the front door and the reception desk. Listen in as sales people "make a pass" at people coming through the front door.
The Waffle House. (That's what we have in the South. You may have Huddle House or other little simple greasy spoon places.) Go eat an extended breakfast and just listen in to the conversation.
Maybe the trick in radio is not to get rid of the "cheap speech" but tyo make it cook, make it smooth. Make it into the souil-food of conversation.
I don't remember the really great announcers and entertainers sounding like they had a doctorate in Classic English Literature.
"Shop Smith's today. You'll be glad you did."