It's done. The icon installs correctly. Should I upload this installer any place? It's really only needed for Mavericks (or later). Example: the Phex site as an alternative OSX download?
I can host it independently myself of course.

Phex connected fine on Mavericks. A touch slow for grabbing 5 peers but eventually 7 after about 5 mins. A couple of Phexs from the connect file.

Arne it did cross my mind to iconize the java executable but that might conflict with anybody who uses Java for other things. Also, I presume Java updates would remove that icon. Not to mention there might be multiple java versions on someone's system which would give me fun trying to script to find the right one.

7-8 months since my last scripting so I was a touch rusty.

Again, a huge thanks to Yvan of MS for the icon scripting.