Unless the lettering is tarnished and unsightly, I wonder why they would want the emblem to go away. Whatever..
Removing the brass letters from the polyester will likely tear out chunks of polyester and look horrible. The brass letters have an adhesive backing, and are applied before the finish is made. Later after finishing, the area is sanded to reveal the letters again, and polished. Thus they are embedded in the polyester. Any attempt to remove them will likely tear out a lot of poly. If you remove the letters, you'll need to prepare the area for applying polyester and fill in where the letters were. If the finish is black, it's do-able. If no,t you'd have to do a lacquer-type of repair, as polyester is hard to match with a wood finish. If it's white, better to find a refinishing shop to shoot a matching paint over the whole case. Another idea is to make a plaque, engraved with the name of the donor, and apply it over the Kawai lettering, or get a piece of black plexiglass and cover the area or maybe drape a nice embroidered cloth over the side to cover it.
Good luck.
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Paul McCloud, RPT
Accutone Piano Service
www.AccutonePianoService.compavadasa@gmail.com------------------------------