Has anyone needed or knows of a way to create multiple angular mates such that they behave in the same manner as Linear Coupler?

Here’s the situation: I have 6 components attached together end-to-end (similar to transmission chain links) to form an elbow that dynamically adjust from 90 degrees to 180 degrees. The angles (link to link) in this sub-assembly will all need to be equal and yet variable as any one of the links is dynamic dragged to a new position in an upper level assembly. The equal angles will cause the components to result in a smooth radial "curve".

This sub-assembly will be inserted into an upper-level assembly as “flexible” configuration and will be read-only.