Yes, good sir, you are. But make sure when breeding microbes for the purpose of inoculation, that you add the nutrients you expect your plants to grow with during that particular stage of growth. This will promote a bloom of only the microbes necessary for the stage you need them in. Obviously make sure that the nutrients you select are rounded and hopefully inoculated themselves with microbes. Look into plasmids, and you will understand that variety in the microbe world benefits all microbes.
When I was selecting humus soil, I looked to my back yard. I used to live in Minnesota, and rented property with ~30 trees. All of the trees were over 30 years old, 50ft tall, and they were given no additional nutrients beyond what their roots could forage from the ground. I felt that this low nutrient environment supporting extremely large plants was perfect for finding true beneficial microbes. They weren't pampered or babied in any way, they only had small animals, nuts, flowers, and leaves to feed on. Yet I watched over the course of 5 years as some trees grew over 30ft! I knew that this forest floor had something special. Boy was I right. Maple trees on my property were constantly lush, and from my bonsai experience I knew that they would produce lush healthy growth even in with extremely restricted root space.
If you find a place that is supporting lots of health C3 type plants, you will more than likely find soil that has unique cultivars of bacteria and fungi beneficial to plant growth. Plants and their symbiotes are very adaptive. You have to view the giant colonies of beneficials from the perspective of civilization. Only under horrible conditions will the wrong species survive. As long as you have properly aerated soil no anaerobic species should thrive, and you should have plenty of great growth. If you are at all concerned about pathogens, test out this new humus soil. I never just change my room on a whim. I'm looking for verifiable evidence to support my theories, and only after several successful tests do I consider a theory possible truth.
When I was making my soil I combined: 30 gallons of forest humus from the largest and lushest trees in my yard, with 30 gallons of my premade soil (inoculated with organic slow release all purpose 3-4-5 rose food chock full of benificials), 3 gallons steamed/microwaved forest floor material, and 15 gallons of perlite. This was watered once a week for a few weeks with about a gallon of water, it really depends on room humidity, and mixed thoroughly 3 times; once every 3 weeks. It takes a while, but you end up with a pile of warm extremely fertile homogenous soil.
This soil should be rich enough to add to your compost pile, and the microbes will go to work. A little bit back I wrote an article about making a composter that adds CO2 to your flowering room. Check it out.
Anyway at some point I plan on digging up all my posts and organizing them into a grow guide, based off of my experience. I hope that this information helps you to understand how you can make organic growing an extremely fruitful venture.
Good luck in your growing endeavors,
ILovePlants