Myself and another forumite wrote to all of the European Aviation agencies and asked if a pilot with a JAA Licence and a JAA IR could fly in their airspace in an N reg aircraft.
What, all of them, all 24, and got a reply from everyone, or are you only referring to the ones that replied? By European Agencies do you mean those signed up to EASA SRO?
Never the less a good effort on your part.
Would you like to share with us the letter you wrote and the reply received?
Mind you as worth while as your quest clearly was for someone flying only N reg it would seem far less time consuming to simply do the foreigh pilot conversion - after all out goes the annual renewal to be replaced with rolling currency, out goes the annual fees and out goes any doubt that might arise from any EASA member that forgot they wrote to you saying it was OK.
Never the less a good job for anyone flying both N and G reg.