Yes, you’d need to make the cuts by drawing curves, trimming them against one another, joining the result into a closed profile and finally using Wirecut. Here’s an example file. The block was then rotated in the last step and wirecut for the other three sides using the same profile curve.
In Windows Rhino you could use the Grasshopper plugin to randomize cuts like this but that would require a bunch of other information to explain and I see you’re using the Rhino for Mac WIP now which doesn’t have Grasshopper. I would just model it manually as shown providing the randomness as you draw the curves.
Wirecut.3dm (750.2 KB)