The glowing red eyes would be trivially easy to do on the computer even with the technology of 20 years ago. The fangs are a bit harder, but still no big deal now.
Just be economical with your shots. If you spend, say, four seconds on the transformation, that’s only 100 frames you need to edit. Immediately after the transformation, put in a cut, and before you re-start, have the makeup folks put on her fang and contact lens prosthetics.
You don’t have to worry about adding in the tags yourself, though. Just paste in the url by itself and the board software will automatically add them in for you.