It is relatively simple to open up a Ltd. company in HK, if you dun want any hassle, simply just pay small fee to small accountancy firm that they will file all the papers for you. To get round of immigration about working in HK, I suggest you can register as shareholder and director of the HK company, you enter HK for business purpose, so you do allow to work in HK (but the hassle is that you need to go out of HK whenever your visa (tourist??) expire, the best is to go to Macau (near HK) and re-enter to renew your visa.
Any profits derived from your HK company will be subject to HK profit tax 16.5%, unless your revenue can be proved that your contracts (sales & purchases) are concluded and negotiated outside HK, but unlikely in your case you can arrange that I believe.
The director fee (or your salary) getting from your HK company will be subject to HK salary tax 15% or under progessive rate (whatever which one is lower), so is very low compared to foreign countries; the entertainment fee are fully deductible (do hire a more easy accountant to audit your account :) )
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