It's your lucky day. The HPT repository happens to have a 2016 Focus RS. There are two tunes listed as Ford Focus 2.3L. Here they are. VIN checks out.
Also, keep the whole VIN thing in mind when you go flashing the tune. Should just be able to put in your VIN from under the windshield glass, but not sure if it'll work that way on these platforms. If you don't have the right VIN that may lead to problems.
https://www.hptuners.com/help/VCM-Ed...change_vin.htm
Well maybe not...it looks like you can't change the VIN in the tune. Seems that the VIN isn't written as part of the tune, and your original VIN won't be affected. Good to go.
Try a write-config first. Write-entire as last resort.
Confirmation on the whole VIN thing might come when the tune is read-out from the PCM after flashed with one of the attached files. Should see the new tune with your VIN (in VCM Editor it's Edit>Calibration Details).
Let me know how it goes I'm curious about this one. Never been in the whole missing/locked tune situation with a Ford.