Hi Hijack,
Not sure you have the answer yet.
I'm about going through your process too,
You do the license confirmation form on the FAA website by filled in one of those license you have, HK or JP, you may need to show at the office for the FAA examiner to check before going to the flight school, choose one of FSDO (check on FAA web).
Within 45 days FAA will contact the local CAA that you're currently hold your license.
Once the confirmation granted it valid for 6 months,
ATP/CTP 7 days (5000USD)
One ATM Test 125 questions 4 hours, 75% is a pass
A320 Conversion Course 9 days (abt 8000USD)
The ATM Test credit hold up to 5 years, anytime after the ATM test you can travel to US to do A320 Conversion Course, don't need to do both at the same time as you may not have enough vacation leave.
Good luck.
Last edited by k26sea; 23rd Jun 2017 at 01:15.