You would do the TWD to USD conversion before sending to HSBC US. IB does not accept TWD, and it’s unlikely you can store TWD in a HSBC US account.
IBKR can accept Euro or USD. The Euro one is in Germany but it just gets credited to your account all the same, takes a day or two at most.
Converting between currencies on IBKR is really good, fantastic rates.
HSBC TW charges $30USD flat service fee + 1% per trade, plus 0.2% custodian fee per annum.
No point dealing with local banks.
Gonna open IBKR account in case QT implodes in the near future.
I’m thinking about opening an IBKR account and I see they have a referral program that gives the referrer US$200 and the referred person some small amount of IBKR stock.
If anybody wants to refer me, go ahead and DM me the link. 
No Canadian residents though, please (if I’m reading that page above correctly, the IBKR stock part wouldn’t apply).
Edit: Competition closed!
Did you find someone? For some reason I didn’t get a notification for your original post
I’m afraid IBKR is currently the best choice out there as other brokerage charge a very high fee but IBKR is strict on their compliance system, some people failed to open an account in IBKR.
I did, I’m afraid! I signed up and added £10k a few days ago, so @qwert_zuiop should be getting the US$200 at some point. I didn’t do anything else yet, because I’m still in the process of figuring out how this investing thing works. 
I haven’t heard of people having had issues opening accounts with IBKR. If you can ID yourself, have proof of address and fill in the self-declarations truthfully, it should be easy to open an account.
Care to share more?
Step 1: wang it all into some radical bullshit
Step 2: talk about how great it is complete with finger guns
Step 3: sell stock at 40% down and never mention it again.
Step 4: Repeat
LUNR 