Am afraid I can't help with the job advice- but can with the rugby!
There is an amateur league in HK, with matches ever Saturday; the league starts again in October, although there will be friendlies/tournaments in September as a start to the league.
My husband plays for Causeway Bay, and they regard both rugby and the partying afterwards as serious as each other!
But there are so many clubs to play for, and each club has many different divisions within them.
I would reccomend checking out,
www.hkrugby.com