I solved this using the spatial tools (and a crowbar!) a couple of weeks ago but I left the non-spatial aspect of the challenge to come back to when I'd had more experience with Alteryx.
I now see my initial solution was needlessly over-complicated so I figured out a better way to do it, as well as solved the non-spatial tool method. I enjoyed working with the spatial expressions!
I left in my first pop at this challenge for everyone's amusement.