Both Alipay and WeChat now have options to let a relative or friend directly use your bank card for payments, including payments with QR codes. You attach them to your account and then set a monthly spending limit. On Alipay this is called 亲密付. On WeChat it's called Relative Cards (on WeChat look under Me > WeChat Pay > Wallet).

This may -- may -- be a way of allowing trustworthy friends visiting China to use QR codes on their phones for payments, if it doesn't require the attached friend or relative to be name verified. But I don't whether this is the case. I also don't know whether it works with Alipay or WeChat accounts opened with non-Mainland mobile numbers.

Perhaps some guinea pigs will try this out and report back.