I don’t know. You probably already know this: I’ve seen it offered by Taobao (about which I know nothing, or maybe I even know some things that aren’t true), but (1) I think you’d have to get it shipped to you, and I don’t know where from, (2) I’m not sure how easy or difficult that would be for a foreigner, and (3) unless I’m misreading somehow, it’s breathtakingly expensive (at least when ordered from one of the sites shown immediately below):
https://iguang.tw/taobao/product/558400393960.html
You know what huo guo is, so I’m guessing you already know about rice porridge and its variants, and that you don’t consider any of them to be an acceptable substitute for Cream of Rice, but just in case 
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