Thanks to the great work looo has done with conda packaging, I was able to put together a mac app using python 3.6. I only used conda for installing the dependencies and compiled the app manually. Eventually it would be good to be able to create an app from the freecad conda package. Anyway, here is a direct link if you want to try it out: https://github.com/FreeCAD/FreeCAD/rele ... t5-Py3.dmg. It might work on macOS versions as far back as 10.9. Interestingly the .dmg increased by 200MB, but I haven't looked into why.
I hadn't really considered changing to using conda instead of homebrew for macOS packaging, since homebrew is pretty standard for developers using macOS. However, with the change to py3, and all the required packages already available with conda, and my very limited time....it is sounding like a pretty good idea to me right now.