Domiciling in California

Yes I think using a relative or close friend as the address but setting up a mailing address at a mailing service box would work very well. Your family member would get no mail other than a very occasional piece but it will meet the legal definition. While not California , but in Oregon I sold my Portland area home and changed my address to my sister in laws and “moved my drivers license ins credit cards etc all to her address but with a different mail center mailing address with no issues. Because I was a in state transfer I provided no info or bills from my “new” domicile , just filled out a change of address form.