

HK airport TWOV into china.
Hi, a family of British passport holders here, with a question about the 240 hours TWOV.
First part of my journey is to fly from the UK to Hong Kong, then to fly to Bangkok for a week.
Then my question to you.
I am planning on flying from Bangkok to Hong Kong then to use the Skyferry service at Hong Kong airport to directly catch a ferry from the airport to Nansha port in Guangzhou- to not enter Hong Kong immigration at the airport. I would then like to exit Shenzhen to Hong Kong 7 days later via a scheduled train from Futian to Hong Kong West Kowloon (with booked seats). I would then fly from HK to the UK a few days later.
Is the above allowed under the 240 hour TWOV ?
Since I will not enter HK immigration when I land from Bangkok, and since I will enter China it will be via the approved Nansha ferry port and also I will exit via train to Hong Kong via approved Futian train station in Shenzhen.
Have I got this correct?