As much as I'd like to see a slew of SLS rockets fly, it's dead, just life support, and needs to be unplugged. The post shuttle brain-drain was slightly delayed because of Constellation/Artemis, but with such a low ops temp, it's just too expensive.
Congress got it backwards anyway. Decide on the mission, then pick/choose/build a rocket based on the mission.
I don't know if it'd have been worth man-rating the Delta 4 heavy, of trying to convince Elon to man-rate the Falcon heavy, but it seems like either would be cheaper than SLS.