At some point I got tired of this layout and started using the built-in one. I understand that there are potentially missing symbols on some new machines. Unfortunately I no longer maintain this repo, but it might be a good idea to look here:
https://github.com/jordanilchev/osx-new-phonetic
The new phonetic keyboard layout for mac OS
As similar as possible to the new phonetic layout found on Windows 7+.
Tested on macOS Sierra.
Move the unzipped file to /Library/Keyboard Layouts/
and select the new layout from Settings.