The messaging should avoid direct language with government saying no to a persons activity, if you wish to appeal to this group.
A softer message that says something like we want people to be free to make a choice but we also want the best for both the mother and the baby and that is why we respect the right to choose that protects the life of both. When the fetus can be safely removed without harm to either involved then we can proceed with the removal procedure. The baby can safely be removed at 28 weeks and with only a 2-3 month inconvenience.
If you read the abortion related law that passed in Ohio the language of up to fetal viability was inserted because they knew it had to be in to garner the votes for it to pass. And so the concern for the life of the baby is still there.
This should be the stance of federally elected officials or in states with constituents divided on this issue. In states that are solidly pro life there is no need to adjust the messaging.