Mixing nylon with steel

Does anyone ever do this? I know zither banjos were strung with a variety of string types.

I'm currently using a nylon 5th string with the long strings all steel - 23w, 16, 13, 12. I think it works super well for 2-finger banjo. It takes some of the ring out of the fifth string without killing it entirely. 

Here's an example of how it sounds for me.