Advice on getting a ki pool?

[noble peasant]

I'm going unchained rogue, so the rogue trick isn't possible, but what would be the easiest way to get a ki pool? I'd kinda like some of those ninja talents...

[avr]

Since you can't multiclass ninja and rogue, you have a problem. I can't think of anything faster than monk. Probably Drunken Master Monk 3, tho' Unchained Monk 3 has its points.

[Trekkie90909]

Fastest Ki Pool (assuming U-Ninja is out) would be either the U-Monk, or Ki Mystic Monk Archetype. Not many other options unless you look at third party material.