Can't you apply to be a special needs teacher instead of teaching assistant? I'd just let the head teacher know in that way :-) that you're ready move up and take on more of what you're already doing (so don't cut my job and pay me more while you're at it!). Let the head teacher worry/fret that he might lose you if he doesn't figure something out.
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"Never give a sword to a man who can't dance." ~Confucius
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