Hooray! I've managed to use the characters from the wiki on another website (specifically, in a Flickr comment). I used this code for each character:
<img src="http://images3.wikia.nocookie.net/__cb20111108021820/nsibidi/images/1/19/20000-30.png" width="20" height="25" />
and I got this:
I hope eventually, after most of the characters have been identified and classified, I can use their identification numbers to develop a character encoding system so they can be interpreted by computers as text and not images.
Update: From now on, when I use Nsibidi characters on this blog, clicking on them will take you to their character page. You will see the following banner whenever I do this: