I think you'd best find a lawyer, first and foremost. According to what I've heard, though, if you're already married and your wife tries to enter the US on a tourist visa, she very well might be turned away and even barred from the country for several years for trying to enter on false pretenses. If a foreigner is married to a US citizen, it's automatically assumed that their purpose for entering the country is to stay there permanently.
Also I think you're unclear in the bit about how you will return to Taiwan to "wait out the green card process." A green card is a card granting permanent residence, which can easily be abandoned if someone leaves the country (just like PARCs here in Taiwan). And your wife's "permanent residence" won't even be permanent until you and she live together in the country for two solid continuous years and then together go into immigration HQ for an interview to confirm that your marriage is valid. (That's where they separately ask you how many windows are in your house, which side of the bed you sleep on, what each other's favorite flavor of ice cream is, etc.)
Things may have changed a bit, but I'd still strongly advise to educate yourself and find a lawyer if possible.