I'd have to agree that the 'word' is not the easiest thing to sort out sometimes, so numbering the 'word' may have very little use.
I've done some reading on the PHP idea, but I wonder about display capabilities. The font is in development stages, and won't be releasable until the whole of the VMS is transcribed and discussed in this setting.
As we've already tested, web-based fonts do not work on all browsers, so that's pretty much out as well. Simple but effective is the goal here.