I just need to say this while David isn't here (love you David)

A contract to make a Lunar Crew Dragon and human rate Falcon Heavy should be made ASAP. Please read this thread. Artemis can be done without SLS or Orion and its fairly simple.

We all know the HLS lander won't be ready until 2025 at the earliest, most likely even later.

That gives SpaceX 4+ years to make the relatively minor modifications to needed for a Lunar Crew Dragon variant. No way to argue SpaceX can't get that done.

Human rating FH shouldn't be a monumental task either. It is built 100% out of human rated rockets. It flies from LC-39 which is geared for Human Space Flight.

By the end of this year FH will have flown 6 times, and again you have 4+ years to do this. Should be easily done.

The end result is NASA gets SUSTAINABLE human delivery to the moon. For a cost of ~$250M instead of a $2B per launch (remember, Orion is $1B by itself). Even more important than cost: Cadence. Instead of once per year NASA could right away be going to the moon 3-6 times per year

The reason for doing Artemis without Orion of SLS (at least in the current roles) isn't out of spite or hatred. The whole point of Artemis is to go sustainably to the moon so we can keep going and stay. The higher cadence and much lower cost is a huge win for Artemis and Science

SLS could be freed up for more deep space missions or maybe even Mars. Or it could use its incredible TLI to bring things no other rocket can to the moon, like large lunar base pieces. Frankly SLS is overkill for bringing 4 people to the moon.