It is more common to use Acryl Amide, Poly Vinyl Pyrrolidone or Butvar in emulsions, and none of these nor Poly Vinly Alcohol resemble gelatin in any way. Gelatin has a structure which is imposed by its protein makeup. The amino acids act to peptize gelatin and it can chill set and crosslink. The others can, but under conditions often harmful to the silver halide grains.
The Silanes probably add something to the mix to improve the activity of the vehicle with the AgX crystals. IDK. It also may supply hardening sites. We usually used a site with an active methylene on it so that we could harden.
I've worked extensively with polymers in order to replace gelatin. It is not an easy task. I await Bill's results.