They definitely should do a run of red Esc keys and sell them at $5/piece - that's what the Topre ones cost.
They are doing runs of red Esc keys now and they're a LOT less than $5/ea. I'm not a big fan of Topre keys at all. And $68 for a set of keycaps for the HHKB is kinda pricey imho.
How do you like the red Esc on the IBM PC AT:
Or if you fancy a littl more color. Note that the keys are printed with full print for a Space Saving Mini:
A more typical layout:
All of these keys came from Unicomp. Other colors available include lilac, light blue, brown, white, grey and a few others. Someone posted a color chart......can't remember who??