Well, I guess there are more qualified people than me to answer this, but here’s a quick stab at answering your questions.
Yes, as far as I know, but remember that if you get divorced, all your rights would be revoked.
I don’t think it matters as long as you have all the right paperwork with the right translations, stamps, approvals etc. I’m sure someone else has more insight to the matter.
Will your money be paid to your account here or in the US or Canada? If you’re not getting paid here I don’t think you have to do anything, since you wouldn’t be filing for tax here. Legal status is a grey zone here sometimes, so in all fairness, as long as you don’t tell anyone, no-one’s going to ask what you do.
Just make sure you really want to live here, Taiwan is very different from the US and Canada and you haven’t said if you’ve even visited. Visiting here is still not the same as living here. How open/outgoing is your fiancé’s family? Just a word of warning, there are people who have posted on here that have had a great relationship with their girlfriend/fiancé, but once they get here, things go south pretty quickly because of their partners family not being as open minded as expected.
Can you live without your creature comforts from back home? Some things you can’t just get here, at least not easily. At least you sound like you’ll be pretty well off here if you can keep your current job which is likely to pay more than most jobs you can get here. Although I guess that depends what you’re doing for a living
Also be prepared that the living standards might be different here to what you’re used to, although again, you should be able to get yourself a really nice place here on a US salary. Oh, and if you’re tall, expect to pay a premium for a large bed
On the upside of things, this is an interesting place to live in and although I don’t like every aspect of life here, I have enjoyed my past two years here. It’s also a great starting point for traveling to the rest of Asia and it’s fairly cheap to travel to most destinations in Asia from Taiwan. You’ll be glad it is after a while, as you can get seriously fed up and then you just need to get off the island. An hour or two on a plane and you’ll be somewhere quite different. Then again, there are people on this forum that have somehow manged to stay sane here for 20 years or more
I’m not trying to scare you off or anything, just have a good ponder about what you’re doing and about your future before you make such a big commitment. At least visit Taiwan before you move here, as you might hate the place, but then again, equally, you might fall in love with the green island.
Oh, and let me be the first to welcome you to Forumosa