gravity32,
Just back from pub where two other ex B757 captains and a very senior (but not B757) TC cannot recollect any TAS correction to altimeter published in our manuals. (Plenty of cold air and mountain wind corrections but not what you are looking for)
I guess that the ADC (Air Data Computer) took all that into account and the standby instruments may not have done so but, if we were down to those, it was considered better not to complicate an already difficult situation.
I wonder if the FDR was taking raw data or corrected data?
Sorry not to be of any help.