If you want to share designs, but you want reciprocity and you want to retain some control, then I wouldn't bother with "licenses" as we have them in the software world - as in "I drop this here, stick a license on it, and someone can grab it and use it under these terms, without ever talking to me".

Rather, offer people the option to sign a little contract in order to use it. Keep the barrier as low as possible, an email exchange should be enough. I feel in the hardware world the barriers are already pretty high and people want to know your detailed business plan, your mother's maiden name and a couple of references before they even share a data sheet. You just want to have an address and make sure they know what they are agreeing to. Keeping honest people honest and so on.

If "the Chinese" want to clone your product, then you are often out of luck anyway. Although that is not entirely true anymore, my previous company fought in China against clones and IP theft a couple times and won. But you need to have a local presence, a local subsidary that can hire lawyers etc.. If you are just outsourcing production to third parties then it gets problematic.