I think at this point its more of a flavor thing... perhaps good in mid levels where the weapon effects like banishing and smiting have some real potency to them or its a stat damage type build. But then why not just go rogue? You need to be doing ki strikes to make it work out well and it precludes the best of them.

Weapon monks do get double procs on strike effects so that's something.

I can sort of see this for Drow, going hard into the shorts sword bonuses, but that's really more a flavor thing. It needs something else in the mix to make it work, something that makes short swords themselves more attractive, or the second tier allowing rapiers or kukri's into the mix.

It wouldn't make for a bad build and I've taken enhancements mostly for flavor but I think it needs some more jazz to make it exciting like some of the prestige enhancements are.