To be clear, Sam ruled in the end that a power weapon CAN be switched out to be either a sword, axe, maul or lance. You can take that bit from any set you wish.
Not that somethings, such as hellgaives, at not power weapons, but a specific type, in that case swords.
Sam, I do have to say in some ways your "clarification" thread was a little unclear, as it included some transitory rulings along the way, and at least in the power weapon case, did not include the final ruling.