Although it’s not guaranteed acceptance like I think some transfer pipelines are, I do see anecdotally that there are lots of transfers from SMC. I know that all UCs do really want you to graduate once you have the credits to do so, but it would be worth trying to ask how double majors or a minor might impact that.
I found this email online to contact with questions: transfers@saonet.ucla.edu
That said, other schools within the system are also very good. UCLA is great (I have one child there), but it’s not perfect and there are both great and not perfect things about all of the campuses. My second child is headed to a different one because UCLA was sadly her sole rejection. She was definitely crushed for a little while, but now she’s getting excited for all of the new and different experiences she will have from her brother, including way nicer dorms.
Whatever you decide to do, I hope you can embrace it and be excited. Wishing you the best of luck!