I recently got my first mechanical - tried to get a white Ninja TKL red, but was told that white TKLs don't get made that much any more. To make a long story short, I ended up with a black Majestouch-2 red and a set of black 104 US Ducky PBT keys which I'm extremely happy with. I love the texture/feel of the PBTs, and I, too, like the hidden-away legends for the same reason that the OP does. AFAIK, these are laser etched.

I bought them in-person from here, but was told that they have limited runs/supplies of PBTs:
http://www.b18.com.tw/for NT1200 or about USD40. I also contacted Ducky channel directly earlier in the week about PBTs and they said they were currently out-of-stock.
hope that helps