If Brainiac couldn't do it, you can be certian some rando shouldn't be able to do it either.
Atrocious was able to tap into another color of the spectrum with magic, Sinestro used an advenced race to make his rings that have nothing to do with willpower, all of the other corps are technology based off the green lanterns corps besides the Star Sapphire (not sure if that's still the case) or made by other guardians. No one on the universe was ever able to replicate or hack into a green lantern until Bendis' OC, that is simply a fact.
And i have seen people mentioning the Green Lanterns of china, i would like to point out that those have nothing to do with the spectrum and aren't in no way comparable to the rings.
The only way to use a ring should be having the power to overcome great fear, it is what makes the ring users special, inspiring. Not hacking. Thinking this OC isn't stupid is being dishonest. There would have been multiple ways to make this work, but Bendis wanted his special snowflake to be different even if it doesn't make sense.