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and for anyone else travelling through HK, here's what the HK Immigration Department told me when I asked them if I can get something like a 1-day pass to visit places around during the transit:
Under the prevailing immigration policy, nationals of Nepalese require visa to enter Hong Kong for whatever purpose, including those who are in transit and remain on the airside.
There are however temporary arrangements under which the visa requirement is temporarily suspended forNepalese airside transit passengers when travelling from certain countries back to their own country when their airside transit period is less than 12 hours in Hong Kong, and subject to the fulfillment of conditions by both the passenger and the carrying airline. In this connection, please enquire the carrying airline to see if your case would suit the temporary arrangements.
If you intend to have a leisure visit to Hong Kong, you are required to apply for a visa. Details of the visa application is outlined in website http://www.immd.gov.hk/ehtml/