Are you sure you need front door handles for keyless start (push button).Of course you need ;-)
Beneath the button you need both front door handles (they contain keyless antennas)
The electrical steering wheel lock
The antenna receivers above the ashtray, in the middle-tunnle near the rear ashtray and in the boot behind the rear seats.
Then of course the KVM module from the rear.
All wiring harnesses (door, floor, dashboard, motor bay) and fuses
Eventually a new BCM.
New keys and a Ford dealer to program them to the cars PATS.
He‘s right - all this stuff is needed for keyless start. Keyless entry adds the door handles (which as well as the lock buttons have antennae in them), an additional antenna behind the rear bumper, new door looms & locks plus a lock switch on the drivers door and outside on the tailgate - so tailgate loom. Also needs to have the correct wiring present in the main car body harness - plus an upgraded wireless module. The keyless start feature is a subset of full keyless entry.Are you sure you need front door handles for keyless start (push button).
Are you getting mixed up with keyless entry?