It's an interesting idea and would make a good experiment for someone with a powerful microscope.
Compost would already have an active population of bacteria and fungi, but commercial inoculants are sold as dormant spores in a carrier containing a food source and other compounds to encourage germination.
The question is: How long can you keep the bacterial populations alive and growing in a water/nutrient mix? Or is that not the best way to culture them? Bacillus subtilis and Streptomyces lydicus are also two vary different types of bacteria with vary different methods of colonization and reproduction, but both need a stable substrate to grow on, so I think you are right about not successfully keeping a small amount of the culture going for long in just a water/nutrient mix.
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