As far as I know, my truck was originally sold in NJ, so pretty sure it's a US truck, but just as you found
@ads245 my cluster has the option on the right screen, but it is grayed out. Lines 726-09-01 and 726-11-01 were also different in my truck versus my wife's Platinum, but changing both of those lines along with the IPC code (720-02-01 **X*) resulted in the DRLs still being on, but the grayed-out option disappearing from the cluster entirely.
There's something missing that is forcing the DRLs on regardless of the coding in the BCM. The dealer said they can turn them off with IDS, which strikes me as strange that IDS can do it, but Forscan can not. Makes me think there is code changes elsewhere that either don't show up in the As Built data from the Motorcraft site, or we can't access through Forscan.
From what I've found, this issue doesn't affect any of the F-150s ('13-14, '15-18), Super Duties, the 2G Fusion guys have figured it out on the '14-up models (along with activating the option on the IPC), and the Explorer also doesn't seem to suffer from an inability to shut them off either.
If anyone has their IPC and BCM data saved via Forscan on their non-locked DRL truck and is willing to share it so i can compare with my truck, I have some free time to give it a look and see if I can narrow it down. I'd like to eliminate the info straight from the Motorcraft site in case there are inconsistencies. It's the only thing I can think of that might be playing an additional factor.