While reading your post I began picturing the Mojave then I got to the southern Nevada part lol. I used to live in Havasu so I know what you're going through, unfortunately I don't know about growing out there. We get over 100 here and sometimes almost every day of summer but it's humid too, the climate as a whole is much different. I would probably try to find a sativa close to a landrace from somewhere like Malawi or Mexico.