Thanks for your enquiry. Boom already launched RMB services for our clients. We allow clients to convert from their HKD/USD into RMB, and keep RMB in their Boom account. If you want to purchase/keep RMB through Boom, you may simply logon, and place a FX instruction from the internet.
On the Boom website, on the top left hand corner, you may click the icon(the Chinese flag) to learn more about our RMB services.
At this moment, the HK stock exchange hasn't offer any investments products in RMB yet. But from the news, it is likely the HK stock exchange may launch RMB products in the near future. Depending on the nature of the products, our clients may possibly purchase them through Boom.
Should you have further enquirires, please feel free to contact us again.