Observer,
It's a really nice thought, but how could you ensure that the selection for this "true" all-star team would be any more "true"? Many times a player's observed performance (and statistics, although those can be even more deceiving) really are fairly dependent on the surrounding team. A forward who is pure magic at putting the ball away might be overshadowed by one with lesser talent whose team is better at getting her opportunities with the ball. On the flip side, an otherwise outstanding goalkeeper may not stand out on a team with a strong defense that seldom allows a shot, while a good keeper on a weaker team has many more opportunities to shine and attract attention.
Any system of identifying "true all-stars" is going to be inherently flawed, because soccer is very much a team sport in which the performance of the individual is greatly affected by the support of the surrounding players--not just by political bias toward "soccer schools."