Unfortunately there is no alternative to Orion so far.
No, Starship may carry people to the moon, but getting them off the moon isn't possible. The lunar Starship won't return to LEO.
The closest thing you could do is send another Starship and do the same NRHO docking that SLS+Orion is already doing and then instead of aerobraking, do a deceleration burn to get an LEO capture. That is the only way without Orion. For better or worse, Orion in NRHO is indispensable.
No, Starship may carry people to the moon, but getting them off the moon isn't possible. The lunar Starship won't return to LEO.
The closest thing you could do is send another Starship and do the same NRHO docking that SLS+Orion is already doing and then instead of aerobraking, do a deceleration burn to get an LEO capture. That is the only way without Orion. For better or worse, Orion in NRHO is indispensable.