Huawei has no 7nm fab available that will turn a blind eye to pirate ARM chips (since their ARM license was revoked), and it is unlikely any new 7nm fabs will be built in China soon. See my other comment: https://news.ycombinator.com/item?id=20077587
Wouldn't one of those joint-ownership project things where one company within China owns 51% of the project work out? It would have to be not Huawei, but would that work?
AMD did something very similar as a way to bypass tariffs in China (license their 1st gen 14nm Ryzen IP to a JV), but they've brought a ton of scrutiny to this loophole from both the USA & China, plus this trick won't work for Ryzen 2 since no 7nm fabs exist in China (and none are on the horizon).