I guess if it is OK for recently arrived Punjabis to settle down with East European women and have Sikh kids then there is nothing wrong in settling down with a Chinese woman.
The Chinese are ultimately a dharmic people (if we take the current political situation out of the question) and have always been interested in what happens west of their border.
There is a massive difference between the Sikh experience in the UK vs the US. The UK is a much better place to be a Sikh.
The biggest difference-maker is population density.
According to the 2011 census, there were (at the time) about 432,000 Sikhs in the UK. Accounting for some population growth and uncounted people (such as illegal immigrants), there are probably at least 500,000 Sikhs in the UK today. Now take into consideration that the UK has a population of about 67 million crammed into a relatively small island. And also consider that most of the Sikhs live in certain parts of the UK that have relatively large Sikh populations (e.g. West London, Birmingham area, etc.).
There are not official figures on Sikhs in the US, but based on data about people from and Indian background and Punjab-speaking background, 250,000 is probably a very conservative upper bound on the US Sikh population. And then consider that the US is a massive country and has a population of about 330 million.
As a consequence, Sikhs are much less visible and much less powerful (as a community) in the US than they are in the UK. In the UK, I feel like most people have an awareness of who Sikhs are. When I have been in the UK, it is a bit of a relief to not feel like I have to constantly point out that I'm not an Arab or a Muslim. In the US, nobody had a clue what a Sikh was when I was growing up. It is getting a bit better now, but it's still not great.
Anyway, aside from how Sikhs are viewed by the general population, I think the population density of Sikhs is most important for the Sikh community itself. It makes for a greater support system for more religiously inclined Sikhs. Further, the critical mass enables people who don't come from religious families to nevertheless gain exposure to Sikhi and get into it as they grow older. That's probably why examples of monay who become Singhs are much more frequent in the UK than in the US.