Either of the two inland routes described is better than slabbing it on the interstate.
Point your ride at Reno, then come down the 395.
Cut over at the 58 and take 247 to Yucca Valley and into PS.
Nice trip. 3-4 days minimum for some enjoyment. More is better.
I lived in Seattle area for 35 years, 20 here in so-Cal. The interstate is for 4-wheels and cruise control.