I don’t know if pluots require more sun to sweeten up compared to plums, but I’d be surprised if that’s the case. Anyway, I understand your objective - you get great fruits grown in ideal conditions from Central Valley (or close to it) and you want any home grown fruit to be as good or better in your conditions. Of course I’m not in East Bay and as others suggested Golden Gate CRFG chapter can get you the local expert advice. Thinking out loud, I’d guess late season Apricots should do better for you than what you can get from inland growers. Very early season peaches/nectarines (like May ripening) should match the quality too.
Chocolate produces ton of male flowers that makes it an ideal pollinator, but sets only a few fruits.
Very interesting story on passion fruits! Fruits (and food in general) evoke a lot of nostalgic memories. That’s why I grow a few varieties of guava in my challenging conditions. In case you like the fruit as well, I recommend yellow lemon guava.