This gentleman tried the sample code and informed me that, although the hijacking part of it does work (i.e., the alter hook), the stuff that allows the <blink> tag through does not, for a few different reasons. In other words, you cannot use the example code in this post to actually enable <blink> on your site. That’s okay, because that part is beside the point of the post, and I can’t fathom why the fuck anybody would actually want that functionality anyway.
So OK, two things — don’t expect the InescapableBlink plugin to actually do anything, and next time I post example code I’ll actually, like, test it to make sure it works. Deal? :)