Breaking news, you can get Tyrael's Charge by purchasing it in the TW shop and selecting EU/US as region destination.https://www.reddit.com/r/wow/comments/7l64qk/tyraels_charger_is_also_half_price_as_part_of_the/
The guy pretty much confirmed it in his thread, but I have also made a ticket to talk with a GM: https://i.imgur.com/37DmUoF.png
The mount isn't available for puchase in EU/US, but if you purchase it in TW and have the destination set to "region EU/US" you will then have to wait up to 72 hours to get it.
If you don't get it within 72 hours, contact support (in TW region) and they will send you the mount or refund the money.
TWD650.00 is about $22 or €19 plus a few cents because of currency conversion.
Card payments will most likely be declined, so use Paypal balance.
This has been known for a few months, but now the mount is on sale and we got confirmation it works.