Here is a version that mixes your amendment in with the current plank:
We completely oppose the legality of abortions performed at any stage of the pregnancy, even for rape and incest. However, abortions should be permitted where it is necessary to preserve the life of the mother. In other words, if the life of the mother is endangered due to the continued pregnancy, the abortion should be performed in order to save the life of the mother. Regardless, we do not believe that unborn humans should have to die for the actions of their parents. We believe that life begins at conception and doctors should have no right to kill a fetus or embryo, because it is a living human. We feel that the complete banning of all abortions is necessary in the Republic. We also support the full banning of the Ru-486 so-called "abortion pill."
If you think that is satisfactory, I will put the amendment up for a vote when we vote on platform changes.
Where you state "We feel that the complete banning of all abortions is necessary in the Republic," should read "We feel that the complete banning of all abortions is necessary in the Republic, the exception being as noted above, that is, permitted where necessary to preserve the life of the mother."