I like this idea too, I have a Giant Contact dropper (min-maxing on my Spitfire) which I recently turned the lower clamp back to front.
It gave me ~5mm of extra forward adjustment, but it's still bottomed out on forward tilt. Post/upper clamp is the limiting factor, but I'm nervous about getting the dremel onto it. I tried a few saddles, and some are too nose high still - especially WTB. Bel-Air 2 is working for now.