Reference for the FD pop-up is in FCOM 4.20.5
What I cannot figure out is if their is any good reason to re-cycle the FDs on final following a raw data approach. The pop-up feature is there.
De-facto, you said:
Following a no FD approach,if TOGA is pressed and below RA 2000ft the FD will guide you until level off (alt hold) via a pop up mode as mentioned above.
I can't find that in the books… maybe it is like that? You're basically saying the pop-up FD's retract when you reach ALT HOLD if the FD switch is in OFF position?