There are no legal avenues to do this. Baptism of a minor is simply an intent of association with a religious organization in the same manner that babies are baptized as catholics. It is not a binding contract.
It's association into a private club. And the owners of the private club are free to kick you out if you don't follow their rules. It's religous law and the state does not regulate religious law. Even when the two conflict, civil law prevails at a civil level, while religions law is ignored but not forced to be changed.
It's the same issue with trying to make the case that when you got baptized, you were pledging allegiance to God and not the Watchtower society. There were several lawsuits after the "Bethel purge", and none of them was successful in convincing a court that the Org did not have the right to disfellowship based on those baptisms.
Instead, the only result was for the Org to adjust the baptism question to make them more in line with the concept of subjection to God through the organization.
So, forget it.