Credit Card is not a necessity in HK. You can survive with 100% cash.
Credit Cards are easily approved, provided that you have 3 month of local employment history and applied for the suitable card. Go to https://www.moneyhero.com.hk/en/credit-card/all and sort by Annual Salary ascending. Get those with 40000/48000 income requirements.
There is no exact equivalent for Secured Credit Card in HK.
There is Prepaid/Debit but it won't help you build credit.
There is a situation where if you put Time Deposit for a few years they would give you credit card even if you have 0 income.