My company might be able to help you approach factories in China. I own a sourcing consultancy and we are unique in making all factories that make samples for our clients sign confidentiality agreements. I also have staff in China would would be able to supervise production and negociate fair prices. If any of this sounds interesting to you, feel free to write me an email or visit my website [see link below] and we can have a conversation.
Good luck with your new product! It sounds very interesting!
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Andrea Snavely
ALC Global Partners LLC, sourcing consultancy
Regional Manager - East Asia
www.alcglobalpartners.com