There would still be reason to abort rather than remove, I think, in that unwanted fetuses would be greatly surplus to the demand created by adopters. If you gave up your fetus to gestate elsewhere, it would face a high probability of never reaching a loving home. If you don't believe that embryos are something morally wrong to destroy, but you do think it's morally wrong to consign a child to that sort of life, abortion would still be the preferable choice.