Making your own bokashi starter culture in place of commercially available EM is incredibly easy.
My goal from the start was to produce bokashi compost without the use of expensive EM, bran or fancy buckets.
The most important component of the commercial EM in relation to bokashi is lactobacillus bacteria, the others are secondary (if at all necessary) and can be cultured in the bucket when conditions are favorable.
I culture my own lactobacillus serum starting with a rice wash water solution.
Making the serum is amazingly simple.