Mode S is becoming steadily more important in Europe
That is certainly the trend we have seen over the last few years. With EASA promising to have more attention for the situation of g/a and recreational flying, couldn't this trend be reversed, or at least slowed down?
@The Ancient Greek: such would be my recommendation, too, if only it were clear where the plane is intended to fly. If a good part of flights are to the continent, it might be more urgent.