While I also am disinclined to think that the Heralds are bound by/committed to the ideals of the order they are most closely identified with, I do think that, though the ideals came later and they are in some way associated with Nohadon, that they had to have been established as power-ups by someone with access to more power (without some substantial evidence) than either the Heralds or Nohadon. As lovely and happy as the ideals themselves are, by their coming to the minds of KR and potential KR spontaneously and verbatim and being linked to the power-up in surgebinding capability, they at least seemingly must be sourced in either Honor or Cultivation (I'm leaning towards Cultivation). I just don't see how anyone else other than a Shard or someone holding the power of a shard could have established the system otherwise.