Let's take the example of Dupuis Editions. Their star comic book character is Spirou. He was created 9 years after Tintin, and without a doubt, he must have been inspired by Hergé's work.
The editors of Spirou had an idea: to make a parallel series
of Spirou apart from the original series
. A reknown comic book artist and writer would make his/her own rendition of Spirou in one book only (one-shot).
There are 4 of these already. The book series are called Spirou and Fantasio by...
. The series don't pretend to take part of the original books. Tintin, in my opinion, should have the same concept, so artists and writers could make their own stories in their own style, but without altering the essence of the characters, of course (the same rule happens with these Spirou series). I don't believe that would be disrespectful. Quite the opposite: it would be a way to thank Hergé for inspiring so many artists and writers.
By the way, here's a small homage to Tintin made by Emile Bravo in his own rendition of Spirou (called Le Journal D'un Ingénu= The Diary of a Young Naive
). Spirou's friends see him without his uniform and mistake him for our beloved reporter!http://spirou.spirou.com/oneshots/04/popup.htm?imgN=extr2b
[Translation: Spirou- 'My word! This must be a real Contagion!'
The kid on the right: "It's TINTIN!"]