Hi Lora!
Hopefully this is good news, but as explained on the Six-Pack of Peaks FAQ:
“You can follow the recommended routes, but this is your Six-Pack — you can modify to take other trailheads. Remember that you only get out of it what you put into it.”
For a hike like Baldy, I would actually recommend sending via the ski hut like you’re planning.
As for the other peaks — you can choose your route. I did San Jacinto this past January from the tram. Granted, I was post-holing in deep snow, but I did it from the tram.