I’ll have a look at DYEK this afternoon if I remember, I don’t know the issue you’re talking about and don’t know how a simple regex matching script could trigger it but I guess it will be fun little puzzle to solve.
On another note, I too have made a script like this, although I called it WK Overlay for some reason (I think because I ‘overlaid’ the Kanji meanings on the screen, and I planned on expanding it to different functionalities). Like many of my scripts I haven’t been able to give it the love that I’d like to, but it does also work on Kanji, although a more manual touch is required.
For Kanji the Radicals pop up in draggable boxes that need to be positioned around the Kanji the first time so they know where to show up the next time.