G-Speed Shuttle XL Advice Needed

We purchased a 18TB G-Speed Shuttle and placed it on a iMAC 27" several years ago for our new photography business and it has been perfect, and still working very well. However, we have grown and need to connect a MacBook Pro to the shuttle the same time the iMAC is working on it.

Is there any possible method of making this work? I would love to do it wirelessly, but I am open to all suggestions to make it happen without having to buy another storage device.

Any ideas??