There is nothing offensive about the word woman.
Woman means something - adult human female.
It doesn't include men, or any adult human males whether they want it to or not.
How do you identity the group of humans that have or have had the potential to gestate and birth a child?
How do you identity the group of humans that may be subject to fgm?
How do you identity the group of humans that are isolated during their periods because it is thought that it is unclean?
How do you identity the group of humans that may be affected by cervical or uterine cancer?
It's not anti-trans to want to quantify a group of people. In fact transmen would be included in all of those groups so it's not anti trans at all.
The one word that sums up the people in all of these groups is 'women'.