So what you are saying is that life as we know it is connected to each of those values in such a way that changing any of them would render life as we know it impossible.To take a rather extreme example, we know what would happen if the negative charge on electrons suddenly became positive. Well, playing around the the fundamental constants, to see what would happen, is just a more sophisticated version of that.
It still seems like it is a thought experiment and it won't get us to a probability of any sort but if the above is what you are arguing then I think I agree.
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