Pollen transmission of a few plant viruses does in fact occur, although it is not the most common method of transmission. If the virus in question is pollen transmissible, bees could facilitate transmission. In all likelihood, however, the transmission would only occur to other passion vines during the fertilization process. I know of no example of bees being infected by a plant virus. While some plant viruses can devastate a crop, others cause minimal damage and can be tolerated. If the plants seem hardy and productive you may want to keep them. Replanting may or may not avoid the symptoms. Your other symptomatic plants may be due to one wide host range virus, or several with more narrow host ranges. Being in California, you have a very wide range of viruses/vector combinations available year round, and there's not a whole lot you can do, especially if you want to avoid insecticides. Probably not what you wanted to hear, but that's the curse of a warmer climate.