In this page, I’ll introduce how to enlarge your lightning port to make usb c cable can enter it.
If you carve some plastic inside of phone, metal bracket will appear. Use PoWeR to remove it. (sorry for no pict but you can do it)
I made 3D printed holder to prevent glass from shattering when clamping it to machine.
Hold it and Start milling.
looks pretty dirty but fine.
Use grinding pen for final touch.