If there was any credibility to this then we should be able to find evidence in Chinese stock prices when they approach 8's and 4's.
I doubt it matters enough to leave any noticeable sign
Do it.
It is doubtful that the BTC price will be driven only by such a small factor. Supply and demand are far more important. The bitcoin price going up continuously means that there are many people wanting to use Bitcoin as a store of value, that can only mean that if supply keeps as it is, the price will explode upwards. If the Chinese buy as a store of value, the value will only go up. It is funny that using bitcoin as a store of value makes it a better one.