I just finished a campaign as a Circle of the Moon Druid involving werewolves. Being that werewolves are technically human shapeshifters, can a Druid wild shape into its wolf form?
No, you must choose a beast
Wildshape (PHB, 66) dictates:
Starting at 2nd level, you can use your action to magically assume the shape of a beast that you have seen before.
A Werewolf (MM, 211) states that they are a Humanoid and therefore not eligible for Wild Shape.