The Impersonal gives rise to the personal? How do you explain that one?
There is no impossiblity there, you just have a limited imagination. If you are going to take the figurative handcuffs off the ultimate being, they come all the way off, not just in ways you can imagine. I am only working on your assumption that the fellow has functionally unlimited power and capability within our universe. That allows for a lot, and isn't particularly descriptive of the true capabilities of a Creator.
To make a rough analogy, just because I only use WinAmp on my computer does not mean that the only thing my computer can do is play music. It may seem that way if that is the only aspect of it I show people, but apparent limitation is just a perspective, not a true limit. The Creator may have a vastly greater feature set than the one you feel the need to assign to Him, and the properties you do assign him implies this very thing.