I find it really tough to believe that Roald Dahl would've actually approved of that part of the film.
Me too, seeing as how he died in 1990.
After Roald Dahl's death, Felicity Dahl started work to create a new CatCF film in an effort to "fix" (or whatever) Dahl's supposed disappointment in the first film. Tim Burton picked up on the script and, naturally, altered it to suit his idiotic tendencies. When the new film was released, I recall a quote from Felicity stating that her husband would've been pleased with how the film turned out. Unfortunately, I can't recall where I saw that quote. The closest I could find is
an article from BBC News that describes what Felicity did and why Tim Burton changed the script.
Within the article, there's an interesting quote:
"He thought it placed too much emphasis on Willy Wonka and not enough on Charlie," said Liz Attenborough, trustee of the Roald Dahl Museum and Story Centre in Buckinghamshire. "For him the book was about Charlie."
IMHO, Tim Burton's film places far more emphases on Wonka than the first film ever hinted at. So, once again, I find it really tough to believe that Roald Dahl would've actually approved of that part of the film.