if you were planning on using a floyd rose, and a locking nut then why the hell did you buy really nice grover tuners? if you have a locking nut, w/e tuners you hav, it's not gonna matter. That's why most guitars with floyd roses have shitty economy tuners, cause you only need them to get into tune, not stay there. So i guess you wasted money either way on the tuners. So you're either gonna have to buy a locking nut, and go through hell installing that, and have wasted money on having grovers, OR you have to go buy locking tuners, and if they wont take back the grovers, you're screwed.
So it's you're choice on which way you wanna be screwed. I'd go the second way. just go get locking tuners, nice ones. Yes, the locking nut would install on the neck, but i would not advise doing it your self, spend n extra few bucks to get it professionally done, and ask the guy to watch him, and even offer him like 15 bucks to teach ya, that way you can do it your self next time.
Also, one more thing, come on man!! you can get a bit more creative than that!! Throw some spice on it!! kick it up a notch!!