You are asked if the sequence of the wheels of the known, unknown and unknowable is correct in the ceremony, and whether this should not be reversed?✶
It is correct as given. The way these three wheels are currently stacked, is an alchemical sequence. An alchemical sequence has to be done in a very specific way for it to yield the desired end result.
It's not logical (when is our work ever "logical"?) to have the known on the bottom, but what needs to be considered is that the purpose of the alchemy of these three wheels is to remove the illusion that anything can ever be known or unknown. That leaves us with the truth that everything is always unknowable.
Then is the unknowable less illusory or unreal, somehow?
The unknowable is a perspective that is the foundation of humility.