I think your filter need to output raw LaTeX, i.e. to convert that element into LaTeX code by your code, and put it in a raw element.

Or you can try to think of some LaTeX magic to do it. I think you still need a filter to capture the difference between a normal image to the one with class, and may be some LaTeX def in the preamble together with a command inserted by your filter could do it. After all, LaTeX is Turning Complete so it might be possible.

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