What about one-year residence permit and flexible employment social security?

You can apply for flexible employment social security with a one-year residence permit.

As long as you have a local urban hukou or a local residence permit, you can apply for endowment insurance for flexible employees at the local social security agency. The required materials are as follows: 1. Local urban household registration personnel, 1 flexible employment personnel's identity certificate (the identity certificate shall be handled at the township (street) labor security office where the household registration is located), the original and photocopy of the resident identity card, and the original and photocopy of the household registration book shall be handled at the local social security window. 2. Handling of local residence permit holders: Bring the original and photocopy of resident ID card and the original and photocopy of residence permit of 1 to the local social security window for handling.