I'm not stateless. I have a work visa. The article explains the pressure of living on a work visa (shut up, get in line, or lose your job, visa, and country). Taiwan is not "home" because I can't start a family here. Even if I didn't care about children's military service, I can't get a Taiwanese passport without renouncing my previous citizenship and going to military service myself. Taiwanese PR doesn't give children nationality, and I would lose the PR if I leave for more than 2 years.

As a British citizen, you can already have permanent residence there. Bringing a partner over has no income requirements, either proof of being together >2 years or marriage (anywhere, marriage is usually valid across countries) [1], I’ve seen hundreds of people bring their partners over to Europe. Your children will be born in the UK and have full citizenship.

[1] https://www.gov.uk/uk-family-visa/partner-spouse

He's not stateless, he's British.