Old Man - it is called poor planning on the designers part. Actually I think the very late in the game aspects of the ZenMaster and Valkyrie were victims of the game being rushed. These are nice characters to use on a replay of the game!
If you are going to try to roll up a new female character to take her into the pyramid to qualify as a Valkyrie - just make sure she becomes a Valkyrie before resetting the adventures.
Wyv