According to PlugShare, there are NO L2 stations of any kind, whether J1772 or campground/RV park, nor any residences listed as available for charging anywhere along the 100 or so miles between Indio and Blythe.
Your only bet is to find an available 120 volt outlet somewhere near the halfway point (like Desert Center), and be willing to stay about 12 hours. There appears to be a gas station/repair shop, cafe, and an RV or mobile home park in Desert Center but none are listed in PlugShare.
You'll run into the same issue in the 135 miles between Blythe, CA and Avondale, AZ. Although there is a listed RV park north of I-10 in Salome, AZ, on US 60 60 miles east of Blythe, it's another 81 miles from there to Avondale. There appears to be absolutely nothing along I-10 between exit 45 and exit 94 (Tonopah, AZ) where you should top off on L1 if you can. Otherwise it's 70 miles from Salome to Buckeye, AZ via Salome Road.
A longer but perhaps less risky route is to charge at Salome, thrn continue northeast on US 60 to Wickenburg (54 miles northeast of Salome) for another charge, and then come into Phoenix on US 60 from the northwest.