This might be a stupid suggestion, but wouldn't it be possible to make the word you want to replace, be replaced by a smilie?
For example... I had a user abusing the ">_>" face/image.... It started bugging some other users... So i just set an embarrasing smilie text with ">_>" and it changed all the faces retroactively.
Couldn't you, in theory, make an image, upload it as a smilie, and set the replacement text to whatever you wanted?
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