The morals you speak of are wrapped in layers of conditioning and isolation from peers. This makes JW children ill educated and ill equipped for life in general, socially awkward and conflicted. The seperation causes them immense pain, low self esteem and stress.
People are capable of being moral without a cult telling them to be so. They learn more from the example you set. If you know that the doctrine is a lie and yet you force your child to attend, what are you teaching them? If you encourage them to follow rules without any sound religious principle and merely to make them acceptable to a group then what sort of parent are you? If you are prepared to step back and let people who cannot make a moral decision for themselves raise your child for you then be prepared that the child may choose to abandon your religion and you and they may also resent that you didn't fight for them and their mental wellbeing.
There are better things than raising a child in a cult. Giving them a chance to make unconditional friends, reach their full potential in arts, sports, education. Helping them grow into happy, confident, reasoning and moral adults is far more rewarding than passively doing nothing.