Welcome to the forum, michelle!
I read the Famous Five and the Secret Seven when I was a kid (back in the early 80s). They were fun.
I really don't like the idea of 'updating' Enid Blyton... Blyton is Blyton, you don't need to 'update' her books or you take the period 'feel' out of the books. You may as well try to update Noddy or the Fat Controller or something.
Speaking of which, in the early 90s some people in the States wrote an updated version of the Bible to try to appeal to young people. It was called 'the New Living Bible'. I always loved the slant that the late, great Bill Hicks put on it:
"Now we have a bible out called 'The New Living Bible', it's the bible in updated and modern English. I guess to make it more palatable for people to read. But its really weird, when you listen to it.
"And Jesus walked on water. And Peter said, 'Awesome!'"
Suddenly we got Jesus hanging ten across the Sea of Galilee. Christ's Bogus Adventure, you know. Deuteronomy 90210, you know?"