Debbie Reynolds can dance and she would be a tie-in to Harry Rigby (producer screwed out of the millions from the revival) who produced her "Irene". (God, the fact that I know all of this right off the top of my head scares even me!)
Though, the harder part to cast might be Jimmy. He has to be lovable, and a bit gullible, but not stupid and not a dirty old man.
I'd think maybe, though they aren't "Box office" names, Alix Korey or Judy Kaye for Lucille.
"A coherent existance after so many years of muddle" - Desiree' Armfelt, A Little Night Music
"Life keeps happening everyday, Say Yes" - 70, Girls, 70
"Life is what you do while you're waiting to die" - Zorba