Upvote:2
would a license I obtained in Hong Kong, and an IDP I obtained in Hong Kong, despite not being a Hong Kong citizen, entitle me to being able to drive in Japan
Yes. (I'm in a similar situation; French citizen, US residence, US driving license + IDP, and had no issue to obtain the IDP with my US driving license via AAA and use it outside the US)
allow me to skip the training license and get a full license through the conversion program and test?
Some countries limit for how long one can drive without a local driving license. The max time for Japan is 1 year (mirror).
Regarding the Geneva conventions, see https://kart.st/en/drivers-license/hong-kong.html (mirror):
Japan is only affiliated with the 1949 Geneva Convention, and Hong Kong is also affiliated with the 1949 Geneva Convention.
Therefore, if Hong Kong issues a international driving permit (IDP) under the 1949 Geneva Convention in the proper format, it is valid to drive in Japan.
An international driving permit (IDP) which is not under the 1949 Geneva Convention in the proper format is not valid in Japan. Please confirm the international driving permit (IDP) is under the 1949 Geneva Convention in the proper format.