I don't know if it's already been discussed and/or put into the guide, but the waveblade from Adventurer's Armory 2 should really be considered as a weapon option. 1d6, 18-20 x2 Monk light exotic weapon. The only downside is that it's a weapon that is only within the Close weapon group, and thus isn't valid for Ascetic Style.
However, I think it's possible to take Modified Weapon Proficiency or Weapon Adept as a feat, and add the Versatile Design modification onto it for the Monk fighter weapon group. Then, having Ascetic Style keyed to Unarmed Strike, should allow all the Ascetic Style goodness to apply to the waveblade.
If you're a monk of 5th level or higher I don't see why you couldn't use Ascetic Style with a waveblade. Moreover, I don't see why you'd have to take extra feats to make it work. The Special section at the bottom of the feat reads:
Special: A 5th-level monk or character with the weapon training (monk) class feature can use Ascetic Style with any monk weapon, in addition to the chosen melee weapon.
Since waveblade is a monk weapon (it has the monk tag in the Adventurer's Armory 2 weapon table) it works for a monk of 5th level or higher. It is in the close weapon fighter's group, so it wouldn't work for non-monks out of the box, but that's not super relevant to an Unchained Monk Guide.
Have I missed something?