Yes, it is possible. Some cultures mix magic systems, and suffer for it. As an individual you would face increased resistance in the Other Side for not following a single system. We don't really cover how to go from one system to another, but it is about as world-wrenching to you as becoming Illuminated (without the cool side-effects).
There is a section in the Advanced Magic chapter about mixing magical systems, and why you don't want to do it if you can help it.
Roderick
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