And literally within just a few months the very same founding fathers started doing that with the Militia Acts of 1792 by stipulating requirements of arms that must be had. The right to keep and bear arms does include the right to not keep and bear arms, something notably overlooked by the Militia Acts.
Not really. If you read the Militia Act of 1792 carefully, you'll see that the exemption includes all others who may be excused by the laws of their respective state. Remember, in 1792 the United States was fresh from creating the new constitutional republic and they were very cognizant that they were a republic comprised of thirteen sovereign states. And many of those states were religious colonies, whose own laws or constitutions specifically excused conscientious objectors.