I don't know about Hong Kong, but in the UK, Pakistani mangoes are available in the markets, and I would suggest buying them online and having them shipped to wherever in the UK you want to.
The USA is out of the question presently due to strict agricultural import laws I am afraid.
Canada does allow Pakistani mango imports, but only from certain approved faciltities that irradiate the fruit to kill all infestations before shipping. The process to get these facilities approved for the USA is presently still ongoing and will likely be very slow in getting approvals.