A monk's unarmed progression is the base weapon damage. I think bonuses would be more like amulet of mighty fists, weapon training, etc... You know, stuff that gives +X to attack or damage for your unarmed strike. The d2 seems to be replacing your unarmed damage in return for making touch attacks and elivering the poison.
In any case, to get that feat as a monk you'd need to multiclass for Poison Use (or be a Drow, I guess, but they have awful stats for a monk) and it's still pretty bad. If you want to make a poisoner, much better is to be an Alchemist. They get poison use right away, eventual poison immunity, ability to apply poison as a swift action, and useful discoveries for poison. Sticky poison lets you get multiple uses out of a single dose. Ultimate Combat has a new discovery to spend a minute (and no gold!) to turn any type of poison into a different type (contact, ingested, inhaled, injury) in just one minute of work! I'm sure that has some abusive applications, though I'm not that great with poison knowledge. First idea I got was inhaled drow poison for 10 ft cubes of "nap time."
Alchemist even gets to craft poisons twice as fast (and at very high levels insanely fast). They're basically THE poisoner class, it seems.