What if your hero asks to be made omniscient, including the capacity to still be able to think well in the face of all that knowledge?
Throw in omnibenevolence if you like, but I think you get some contradictions if you ask omnipotence. Either that, or you and Omega coalesce.
How could you test your omniscience to be sure it's the real thing?
Asking to modify yourself may be a useful strategy, (or maybe not, as you note) but it's not something that's available to philosophers trying to prove the existence of a god. As far as we know that is :)
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