Definitely go through the Third Country Verification, need certified copies of licence, logbook, medical - Form SRG2142.
https://www.caa.co.uk/general-aviati...-icao-licence/
Much easier to do whilst in HK as they can be signed by the fleet manager etc.
Talk to the help desk folks at FCL - I have found that they are normally very helpful - it is tho a long process especially if you need an initial Class One, so don’t delay…..