I live in Scottsdale and need to feed my W/H waffle addiction at least once a month. I was looking at your route, I ride either my BMW R1100RT or my classic 82 Suzuki GS850G on that route a minimum of three times a year. My oldest son lives in LaMesa and my Mom still lives ion ElCajon.
Last time I did that was over Thanksgiving only this time I did it a little differently, left the Phoenix area out to Wickenberg, Parker, Joshua Tree National Park, Palm Desert, Warner Springs, Ramona and on in. On the way back through Jacumba and as much of the old 80 as possible then through Brawley, Glamis and back to the Casa. Ended up right at 1000 mi. and a great change up.
Speed doesn't kill, It's always the sudden stop that gets ya...
1982 Suzuki GS850G The "Zook"
2000 BMW R1100RT