I'm sorry but you're not understanding trademark law. The headstock shape equates to the swoosh, end of story. The headstock shape does not equate to the Nike name and logo, nor does the swoosh equate to the Squire decal. I can't make it any clearer.
This is a good point, and why seemingly the Fender representative continued to engage on the subject, requesting photos of the serial numbers, although seemingly replying that it wasn't good enough, and that the logo needed to be on the front of the headstock. We can debate whether that's nice or not nice, good business practice or bad business practice, but not whether they would win in court. They ARE right. And the thread title is misleading. They don't care what you do to your own Fender; if you sand the headstock. This is about commerce. This is about selling goods that bare the trademark. They are within their jurisdiction. In Dominus' signature he says he has over 15,000 eBay positives. That means he is heavily involved in commerce. He "regularly" sells Fender parts I assume? Parted out Fenders? Then they have a right to communicate with him. It's not a one-off used neck sale because you bought a Warmoth to replace yours...
Again I'm not saying I'm "on Fender's side" here, or that I would advise them to do this. I'm only telling you guys the reality.