I've been composting for a while in the old back yard, but I also homebrew 啤酒, sake, kefir, and sourdough. After taking a gander at EM concepts, it would appear that it's all a culturing of my hobbies, then chucking them in to finish the job...effectiveness of EM is under debate, but, what would be the effect of tactically culturing the normal compost bacteria, and then adding it back in to the pile? Maybe nutrient broth or just a molasses agar sheet?
Composting involveskefir sourdough a variety of bacteria and fungi. You need aerobes to consume oxygen so the anaerobes can live. If I were trying to culture, I'd use the compost pile as the primary culture. Put a temperature probe in it. When the temperature (relative to the air) is just beginning to fall of, take a sample. Grow them on agar (or better yet a cellulose-based gel) with a poor broth in anaerobic conditions. Let the cultures proceed until the gel is pitted. That organism breaks down polkefir sourdoughysaccharides.
Composting bacteria are cultured commercially and sold to people who don't know that they are naturally present in the soil and do not have to be added to the pile. You COULD make a culture but you'd be wasting your time. Another problem is that the bacterial flora change with each stage of composting, so you'd need a series of cultures. I'd suggest that you stick to homebrew and other useful cultures. (What? No yogurt?)
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