What is done on the Ti Birdy doesn't give any idea about what can be done on a Birdy III since the frame is totally different with different dimensionning, its not a titanium clone of the Birdy III frame.
The Ti Birdy has a FSA SL-K Light carbon crankset with the proprietary FSA chainrings and the frame has a FD mounting bracket soldered on the frame adapted to the chainline obtained with this crankset (which is a road narrow chainline crankset like a Dura-Ace, Ultergra, 105...), not a FD mounting clamp.