Go for it!
I drove my GN as a GN for 11 years and nearly 200,00 miles. By then it was in dire need of paint and had run mismatched wheels for years. (I was running stock GN wheels up front with two Weld Draglites in back after two GN wheels were injured.)
Anyhow, just before I was to get the paint job done, I went to work for Hypertech. In the year and a half that I was there, I saw the company owner's three GNXs every day. I even got to drive one a couple times (& replace a bum TCC solenoid on it). The look grew on me and I had to have it.
The emblems on my GN were stripped, the paint went on and so did flares, vents, GTA wheels & two GNX exterior badges. I don't care that my car has T-tops and real Xs don't. I don't really care that I don't have the GNX dash or interior emblem. After all, it is a Grand National, not an X and
I think it looks just right.

(I even purchased embroidered floor mats after the paint job that say 'Grand National'. Makes up for the emblems I removed from the fenders.)
Funny thing is, the only time I was asked about whether or not it was a real X was last year's Nats of all places. Buick enthusiasts who apparently didn't see the T-tops before they asked. It just caught their eye.
Around town, a very small percentage of people even know what a GN is much less a GNX. And those that know what a GN is don't even seem to notice the GNX badges because they'll compliment me on my GN and won't even ask about the GNX badges or exterior styling cues. Perhaps they think thats what all GNs looked like, I don't know.
When I place the car in local shows, I do explain on a sign that it is a GN that has been enhanced as
a tribute to the meanest turbo Buicks constructed. That's the way I look at it. It's a salute, not a clone.
As a side note, I just picked up some orange die-cut vinyl this weekend to complete the GNX emblem on the rear of my car. I envisioned doing this before I had the car painted but never got around to it. It'll soon say, as it does in my sig,
GNX'd.
