How to convert a bar into an axle or pin - Using the Axel Hub with Four Bars I would like to utilize the Axle Hub with 4 Bars (#48723) in a way that the four bars would become axles. What is the most concise way to accomplish that?

Here is a diagram of my end goal:
Here are couple of ideas. You could use pins:



Or axles with studs on the end:



Or axle connectors and axles: