To get the attention of all the units en route you'd have to make sure that you put the all AFTN addressees of the units individually in the address part of the flight plan.
If you send the flight plan via your home ATC unit and don't do the above, all they'll do is use a collective computer addressee and the destination airfield address.
The collective address sends details of your flight to the area FIS units you'll be transitting, but not necessarially airfields.
At our place, if we recieve such a flight plan the computer will generate a flight strip with all the details on it. Most airfields with class D airspace will have this facility, but whether all of them utilise like we do I know not.
Hope that helps.