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For that bike I would start with a high quality 20w50 synthetic bike oil. Oil of that nature should be good for 5-6000 miles, since that's what you anticapte, you can then change it at you connivence when you return home. There is no need to change the oil at 3000 miles any more, that's an old hold over from the dark ages of 1970s era dino oils.
Not quite sure why I didn't research all of this before I bought the bike but I guess it was a heart over head purchase.
That means you are doing it right. Follow the heart first (like buying a motorcycle for an epic trip). Then use brain to figure out how to make the plan work. As a Scottish dude once said: “reason is, and ought only to be the slave of the passions, and can never pretend to any other office than to serve and obey them.”
Persig would be proud of SoCal, then.
Skip the oil change. Running long distances every day on an extended tour is very easy on the oil. I would just start the trip with fresh oil and filter and then not worry.