you aren't stuck with the side printed keys...
you can always get the blanks, or you can get artisan blank keycaps.
or... additionally you can purchase one of the leopold capacitive keyboards, or realforce keyboards... just for the caps. and just sell it off afterwards.
most people wouldn't mind using one of those boards with the hhkb caps on it.
that is what i did. because the media side printed legends really bothered me aswell.
however. i don't mind the other side printed legends on the right hand side that you get with the fc660c keycaps.
here are my two boards.