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Seeding with cold loving bacteria should not be a problem, if you have a reliable source for them. But am wondering if this would need to be done every year as I would expect they would die of in the heat of summer.
Further, I wonder if it would be necessary. at a minimum air temperature of -15 (Celsius, right?), your frost line would be around 0.5 m below ground level. If you build your greenhouse right, it should be well above freezing all year round - I've seen greenhouses maintain above freezing when outside air is -30 C, without additional heating. Also the digestion process generates heat, so if its running well, in the ground, and in a greenhouse, then it should never get cold enough to kill the normal bacteria.

I guess the question would be whether the cold loving bacteria or the normal bacteria would be more efficient at the expected temperatures?