I doubt you can link your HK Bank Debit card RMB account to your WeChat, you can only link your HK bank Credit Card to WeChat, or use HK version WeChat link HK Bank account with HK dollar. Because outside China RMB is called off shore CNY, not Mainland CNY,they cannot be freely exchanged.I have HSBC Hong Kong account with multi currency including CNY. It works similar to a Mainland Chinese account. I can use Alipay and Wechat wallet online paying CNY.
Your HK Bank Unoinpay Debit Card is nothing special or have any advantages for consumption in China.
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