Hello,
I'll provide a short answer here to avoid getting too far off the topic and will send you (Jenia) a private note.
The life cycle of the fig wasp is somewhat complex which, includes some very specialized and exacting parameters. The wasp only lives a very short time after pupating from the larval stage. It is dependent on the caprifig for shelter and food. It needs an environment that does not freeze (not sure of the exact temperature extremes). The timing of the emergence of the wasp with the fig to be caprified is also critical and you would need to learn about the cycles, matching caprifig with the fig to be pollenated. So, putting them in the garden like lady bugs does not work quite the same way.
If you were willing to grow caprifigs, learn about the in-depth requirements, it might be possible to "raise" some fig wasps for an experiment. Having a greenhouse that does not freeze during the winter may make this more feasible for overwintering purposes.
I would recommend spending some time learning about the fascinating life cycle of the wasp before taking on such an undertaking. You might have a better chance of success.
Lastly, there may be sources of caprifigs (containing fig wasps) from California, but that should not be pursued until your other research is completed.
Take care,
Ingevald