You can Google to find if there is a gifted homeschoolers group near you.
I find that in general unschooling groups tend to be welcoming and have a child-led learning perspective that accepts kids going at their own speed... I just avoid subjects like vaccinations with some of the parents.
Of course, each group is made of individuals, so the only advice I can offer is to keep trying.
I have found groups through Facebook, meet up, and Yahoo groups.
This is one place to start...
http://giftedhomeschoolers.org/resources/local-support/
