I agree about the fight you mentioned! It's one of my favourite scenes in all of Spirou comics. I'm fond of Fantasio and Marsupilami, and it's fun when they get their 15 minutes of fame, instead of Spirou being the hero like always :)
I don't have plans of scanning/translating more bits from this story, but I've got some English Gaston Lagaffe strips that I've been thinking of posting.