I have several times replaced breakfast/arrival meal with Katsu curry with no issue. I've also seen it on HND-SYD. One thing of note, though: sometimes they put in mushrooms, sometimes they don't. I hate mushrooms. Since my J class experience is usually leaving Japan towards the US, I'm still in "don't make requests to customize food" mode and will just quietly pick them out, so I do not know whether they can prepare it differently upon request.