I never really got the blank-key thing. You're not supposed to look at your fingers when you type anyway, right? So why would it matter if they have legends or not? Are you worried that you'll cheat and look down?
If so, it's really more of a self-discipline thing, isn't it? We can't go through life removing everything that tempt us because we're worried we'll give in to them. Character comes from discipline, not removing one's options to avoid temptation.
(And BTW, these aren't caps but keys. Caps are the upper part of two-piece IBM keys, which consist of caps and stems—that's why they created the extra term.)