Thanx for your answer!
I will try your process. Maybe without passing by AI (opening the different PDF directly in after).
I'm thinking like you about designer and AI. I bought designer one month ago and i'm already using it, instead of AI (not completely but almost), for working!
Now, if they could fix this question of exporting gradient, blur and the compatibility with after, it would be really cool.
Another thing that should be nice is the possibility to transform a vector line in a form (looks like it doesn't exist already). I really miss this illustrator fonction.
One more time thanx for your help!