Nick here from Shopify.
Were you able to find a 3PL in China in the end?
Can I also ask where your store is located and where the majority of your sales are happening? The reason I ask is because I'm wondering if the Shopify Fulfilment Network (SFN) could be useful for your business if you are based in the USA or Canada.
Let me know if it does and if you have any other questions about it, don't hesitate to ask in a reply here!