Being a cynic, I wouldn't necessarily suppose that the Commissioners know the details (in the same way that my managers don't know the details of much; or MPs for that matter), but they should, and so the letter has chances.  Ditto for specific MEPs and committee members...

My lack of knowledge of the structure and the process(es)...

Maybe the same approach for signatories to the letter?  Yer goodself, of course.  Jerome, if he agrees with the content (and can act as "head" of ET.)  DoDo (if s/he wishes) has the technical skills.  Migeru, if he wants to push the spanish angle and agrees with content.

Me, nowhere mate.  I'm the one in the bar waiting to hear how it went.  Learning "go".  

(I taught it to a friend of mine.  Great game.)

(I'm stuck at 16 kyu.  I can cheat and get to 13, but in truth, against igowin, I still need a three stone handicap to win confidently.)

Don't fight forces, use them R. Buckminster Fuller.