I did my insurance checkout in one at Executive Flyers in Sacramento (KSAC) before I purchased mine. I’m not sure if they still have it available for rent.
I believe ACI is the only game in town. They are very GA friendly.
Maybe take a peak at Oceano before you commit to SBP. It’s a really fun airport and a easy walk to the beach.
Sometimes you’ll get a “state your intentions” or “what is your on-course heading” or “what is your next point of navigation” but they are just trying to figure out which sector to pass you on to, not because they are annoyed or really care.
I keep an InReach mini in my plane. The monthly service charge is a no brainer compared to the potential utility of using it in a forced landing situation outside of cell phone coverage.