I think that you could establish some BSF around your place without much trouble. You could order a small number of larvae and feed them until they're ready to pupate. Then you would release the prepupal larvae in the area that you want to culture BSFL. When they emerge as adults they will hopefully breed and the females will seek out a food source which you would have ready. I think each female lays something like 900 eggs.
If you try this I recommend keeping a few pupae in a container so you can know when they're emerging. I believe the transformation takes about 2 weeks so you could probably estimate the timing. I have a post at my blog where I'm testing the pupation time of my first larvae from this year.
