If you want drop bar STI shifter with a super low ratio, this post here may catch your attention. I've tested it for a week by now and the shifting is as crisp as with my 105 crankset. I still can't believe it is working so well. I was expecting some lag while changing gear but no.
I'll still solder a little plate between the two fork of the derailleur just for safety, but my chain never dropped for the week I've used it.
Mountain Crankset vs STI Groupset / It?s Alive! | Cycle/Naturel