I applied for the CTBC China Airlines business card as I already had another CTBC Credit card. No annual fee when using e statements.
I wanted a higher limit than provided so use my overseas PDF from HSBC HK. Banks don’t care how many different banks you have credit cards from,
Suggest you read this thread.
PS I am no longer a foreigner in Taiwan but I used to be.
Since I received my CTBC China Airlines card I have racked up 15000 miles on my credit card spending since August. The CTBC card has my China Airlines Dynasty membership number on the card.