Wow, that looks like a superior gear calculator than on Sheldon Brown. Still haven't totally grocked it, and I'm an engineer. Trying to grasp the above in gear inches, changed units to that, but didn't display.

I have almost that exact setup, 50/34 x 11-30, but on 20"/406 1.75"/44 tires, which gives me 21-85 gear inches. I don't need taller, but would like a bit shorter than 21 (without sacrificing the 85, that is minimum for me) if I tour with loads, on hills too long to just climb when standing.

I think a Brompton style frame, with 20"/406 wheels, on paper should only be about 2"/50mm bigger in each direction, still quite compact, but be superior in every way; better ride, no need for IGH so lighter and capable of field repair, lower maintenance costs, and much wider choice of tire sizes available.