as for trust of value. you DO NOT need to rely on consensus of a fixed fiat price for the whole world, you do not need to rely on a central government department of statistics.. everyone knows what a fair wage looks like in their area, and they can all work out a fair price for bitcoin for their area.
No, this is patently unworkable. You say that everyone knows what a fair wage looks like in their area. Even if this were true (which it is most assuredly not), each one of these persons would have a different figure in mind.