Quickest and cheapest way from Hong kong to yiwu

I am travelling to HK but also need to go to YW. I am looking at going from hung hum station by train to guanzhou east station, then getting to airport and flying to yiwu from guanzhou. Is this the best and cheapest way to get to YW, as fly from HK to guanzhou and then gaunzhou to YW, the cost is very high. I am looking at travelling around begining of april, i did not find direct flight from HK to yiwu at this time. if you could suggest better way, this would be great.