I have been homeschooling in the Philly area for a decade. I have never heard of anyone partial homeschooling in PA. I am on all of the lists and well networked. I have to think if this were possible I would have heard of it.

There are several drop off day programs for homeschoolers in the Delware Valley. I am on the board of one that serves gifted homeschoolers. My kids go there two days per week. If anyone is interested in learning more, please feel free to pm me.