The statements above are wildly optimistic, and don't actually take into account the actual capabilities and capacities of the launch vehicles in question. Furthermore, you're showing an extreme disregard for the actual engineering problems at hand here. It's a multi-decade process to design, build, and certify a launch vehicle _for LEO_. Handwaving "we can do it in 5 years" because the sales teams at SpaceX said so is, frankly, not a real answer. Talking about the "good state" the SLS/Orion are going to be in is, frankly, optimistic to the point of being naive.
Spewing factoids about spacecraft that don't actually exist beyond a "we blew it up on a launch pad" isn't an answer - it's a pipe dream.
Furthermore, you've deftly evaded even acknowledging the core problem - we don't have a space craft with an engine that can do the "back again" part of an L2 mission. That capacity literally doesn't exist right now. You can't just whistle up a rocket that works a few million miles from home.