I don't think that the list that you are looking at is on your computer. They should be located on the printer itself... the HP Utility is basically a basic web browser that queries the printer.
If you have the printer on your network, go to your web browser and type in the IP address of the printer.
In Main -> Submit job
you will see that it looks exactly the same as the HP Utility's interface, with some differences on the help information but the user interface etc. is identical. My guess is that in order for you to change the available color profiles you will have to hack the firmware and then upload that to the printer...