Thanks for sharing this find! It is interesting to see this, although for US customers it might be more straightforward to order from EK.
Speaking of EK and the RF 87u 55g, I just purchased my second one from them. Now I have both the black and the white versions. On the black one, I installed a set of white HHKB alpha keys, and I replaced the Windows bubble keys with black Alt keys from a HHKB set.
BTW, I was able to get an advance-release CM Novatouch and compare it with my RF 87u and other Topre-switch boards. Although it is nice to be able put Cherry mx keycaps on a Topre-switch board, I find that I prefer either the HHKB Pro 2 or the RF 87u to the Novatouch for a variety of reasons, including sound and feel. In addition, I could not remap the Fn key on the Novatouch, but I am able to create and remap a Fn key on my RF keyboards, and the Fn key on the HHKB is ideal as it is.