I have to agree with Bob.....Roger from the first year would have made an excellent Scrooge for sure. Can't see Burke as Bob Cratchit though....Burke was too strong-willed to take any crap from Roger.
Or maybe have Barnabas as Scrooge and Willie as Cratchit....Scrooge abused and took Cratchit for granted, as did Barnabas with Willie a lot of times.
I suppose David could have been Tiny Tim, the 1966 David that is. Vicki could be Mrs. Cratchit....
As for Scrooge's Belle, maybe Laura or Josette, depending on whether Roger and Barnabas ended up as Scrooge...although I can see Laura's Belle burning Roger's Scrooge to a crisp when she got fed up with him.
Maybe Ben Stokes as Marley's ghost.....
Maybe Carolyn as Scrooge's sister Fran and Joe as Fred, Scrooge's nephew. I know, Carolyn and Joe were romantically involved at one time, but remember what Roger said about his 'incestors' lol....and we know the Lauras of the show really got around with the Collins men....
Ghosts of Christmas Past (Naomi), Present (Carl, the present ghost always had a wicked sense of humor as did Carl so I think this would be appropriate), Future (Mr. Best, most appropriate choice, by far).
Can't think of any roles for Quentin, Elizabeth or Julia though...