First of all, you can always order the accordion with no name on it. Anytime Dad has extra time, he makes an extra accordion or two to sell as-is in his shop. Those don't have names. Anyone can ask not to have his name on it.
Second, yes, a luthier would be a great fix. If you want to do it yourself, however, how about filling it in (it's engraved) with a wood putty, sanding it down, and matching the finish? That's a little scary, though. You could also bring it to Dad and ask him to change out that plate.
I bought one of those "extra" accordions in april of 2005. Key of C, just what I was looking for. A small brass nameplate or silver whatever you like works great to cover an existing name you wish to get rid of. That what I did to "little red" ACADIAN, the 9 button that california cajun orchestra used on one of their albums.