Well, considering Everbright is a suffix, it can't be the only prefix.
But Everbright does make the weapon a "Blueshine" one. And since Everbright does add it's own value to the weapon (it's a Blinding effect for weapons), it very likely would be a standard suffix, like Pure Good, where you can have only one.
But if they say it can be otherwise, I'm waiting to see a weapon that proves it.