Is there anyway to change your class FROM hero once its been adopted?
Nope, it's intended to be permanent. It does pretty clearly warn you about that on the class change page.
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Timothy Collett
"The only thing you can't trade for your heart's desire...is your heart." "You are what you do. Choose again, and change." "One of these days, someone's gonna plug you, and you're going to die saying, 'What did I say? What did I say?'" ~ Miles Naismith Vorkosigan