If your concern is with the Taiwan ATPL, then I don't see any problem? There are no flying schools in Taiwan, so no matter what you will be getting your ATPL from some other country.
As for the endorsement, other countries will accept the experience, but not normally the endorsement.
Options
1) do a sim check in your country to put on your ATPL.
2) Go through the USA licence system, then your local authority more than likely will accept the endorsement through the FAA
3) don't worry about it
