Yes, you may just install new lights. There is a decommissioning kit for vehicles equipped with the headlight lighting options which a Ford dealer may be able to order for you. It's a small pigtail that plugs-in to the strobe/turn wiring harness and has a regular bulb socket to replace the Whelen strobe/turn bulb & controller assembly. I removed the Whelens in my PIU, saving them in case I want to use the strobe functionality in the future, and used those to install cheap aftermarket LED turn/DRL bulbs.
The part numbers are 2U5A-13411-GB for the socket, and 33471-0301-11125 is the part number for the Molex MX150 connector on the harness end of the pigtail, there's no actual Ford part number.
Another option, if you like the LED signals (they are rather nice) is to get the assembly from an Interceptor Sedan. They run around $100 or so each on eBay. It's unclear why the sedan parts are so much cheaper. They are slightly different physically, and would need one of the twist-lock tabs to be filed-down slightly, but electronically, they're identical.
I personally tried installing the sedan version from a car I was going to use for parts. They worked perfectly when I tested the signals, but I just couldn't quite get them into the headlight housings. When I compared them to my originals that I took out, I noticed one of the tabs is ever so slightly off, just a few degrees. It's like Ford did that just so they could charge a bit more for the PIU version. Rather than filing the tabs to confirm this absolutely works, I decided to start driving the somewhat wrecked sedan, because it's a really quick Ecoboost (fastest police car from 2013, as tested by the Michigan State Police), so I reinstalled them back in the car. It just seems almost certain that they will work with that modification.
