Cherry G80-3000s exist with thick PBT keys, beige/grey colour scheme with either dye-sub or laser-etched legends. Cherry's lasering at the time was not as high quality as later on, so the letters are less dark and can be a bit shifted. I have two sets of lasered thick keys myself that I got pretty cheap from guys on GH/Deskthority and it looks wonky if I mix keys from both sets on the same keyboard.
The big reason why I have not mentioned it before in this thread is that there is always a stepped Caps Lock and 1.5u Ctrl and Alt modifiers, no Windows keys etc. so they won't fit on most modern keyboards. Also, the dye-sub can be more difficult to find, and when you do, they are often very expensive. Therefore, not much of an option.
I don't know about G81 keyboards with these keys, though, but they could exist.