I'm not sure how this would work, but one difficulty I had after upgrading my Bifrost to Bifrost multibit was nailing down exactly how much of the upgrade was sound and how much was placebo. Some people have pickier ears than others (I have yet, for instance, to hear a decisive difference among Toslink, gen2, and gen5), but if an old Yggy could be provided at the Schiitr alongside the new Yggy, listeners might be able to determine for themselves whether they can hear a difference. I can't think of another venue where this kind of comparison would be possible.
I think part of the problem here is that, looking at the audio chain as a series of bottlenecks, Mike gets darn close to 100% transparency with the old Yggy, indeed with Bifrost Multibit, such that improvements, while the result of tremendous effort, offer diminishing gains. Taking 99% transparency to 99.5% halves the opacity, for sure, but most of the engineering work is behind one, not in front.
Am I nuts?