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the way I understand it, you're right until the last part: the energy coming from the sun is fantastically high and so bouncing / retaining even that tiny emissive IR is holding net energy to the earth system - we're absorbing it only because we can't get rid of it
The problem is why the emissivity term in the Stefan-Boltzmann equation is changed by the GHGs. Do you understand why that is, since the net absorptivity is not?
I might just be restating a point you've already thought through, but I think the key here is that the emissivity for the sun and Earth are different, and the ghg's only affect the Earth's emissivity.
I think we need to be more clear about what is absorbing what: the earth (like, the rock planet) is absorbing and radiating energy, the GHGs are reflecting universe energy back outward and bouncing earth's radiated energy back at the earth. so the emissivity is more specific?
I think you're trying to apply SB to the whole planet system as one radiation object when the real crux of your question goes back up to the initial statement which is "UV comes in, IR goes partially out" and so the part about GHGs being fully absorbing for the planet isn't true
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