I can’t help you with Orville he’s gotta Johnny Cash/Morrissey/Chris Isaak/ Roy Orbison thing going on that I personally love.
Crockett though you MAY be in luck. His early music he sang with a bit of an manufactured affectation that would come off almost like a lisp. I didn’t bother me personally, I found it almost endearing. I am aware that the lispy affect did turn some off to his vocals. If you are one of those people you are in luck. His last two albums have almost completely done away with it. They might be worth giving a shot if you are curious.