Also: in all risk analysis you'd have to consider the upside. The upside here is none. We are 99.9% sure that there's nothing special about our side of the mirr

Also: in all risk analysis you'd have to consider the upside. The upside here is none. We are 99.9% sure that there's nothing special about our side of the mirror. So with 0 upside besides "writing a paper" or "because no one has done it, so who knows?", it doesn't really matter that the risk may be small. It just doesn't make sense to do it.