So, it does seem that de-crab in the flare is the way to go, instead of at 100 ish feet then wing down.
ABSOLUTELY. Do not consider using wing down technique from 100ft
The Flight Control logic would fight you all the way with that technique imho. Squeezing off the drift in the flare is the way forward, and I found nudging (and releasing) the into winf aileron at he same time as squeezing on the rudder pedal worked nicely, leaving the Flight Control logic giving about 1deg wing down in the into wind direction. After touchdown when in direct law, resume normal procedures and 'fly the wing' with into wind aileron as on any other aircraft.