How to set a binding offset with tufte-book class?

Question

I'm typesetting a book using the tufte-book class. For printing I need to set a binding offset (say, 0.5in). However, I can't seem to get this to work using the geometry package settings as one would expect.

The MWE below shows an extreme value set for the odd page, but the even page doesn't shift to the left as expected. Any ideas on how to get this to be symmetrical?

I have tried the answer given in How to create twoside book with oneside margin? by godbyk but this breaks the positioning of the footnotes / margin figs etc, and the page number on even pages.

\documentclass[a4paper,justified]{tufte-book}
\usepackage{mwe}
\usepackage{showframe}

\geometry{landscape,inner=1in,top=1in,bottom=1in,textwidth=5.5in,marginparsep=0.5in,marginparwidth=3.5in,bindingoffset=1in}
% Below from https://tex.stackexchange.com/questions/83695/how-to-create-twoside-book-with-oneside-margin
%\geometry{bindingoffset=30pt, asymmetric, reversemarginpar,landscape,inner=1.5in,top=1in,bottom=1in,textwidth=5.5in,marginparsep=0.5in,marginparwidth=3.5in}

\title{Example Title}

\begin{document}

\mainmatter

\chapter{Example Chapter}

\blindtext[3]\footnote{Testing footnote placement even page}
\blindtext[3]

\section{Example Section}

\blindtext[3]\footnote{Testing footnote placement odd page}

\end{document}

EDIT

To get a "pseudo bindingoffset" I added the following after setting \geometry:

\setlength{\evensidemargin}{-0.5in}
\setlength{\oddsidemargin}{0.5in}

This has the effect of shifting the layout to the left on the even (verso) pages, and the right on the odd (recto) pages.

I would assume this would result in an equal margin between the edge of the page and the text. But it doesn't... So there is an amount of manual adjustment to make it optically 'correct'. This is close:

\setlength{\evensidemargin}{-0.3125in}
\setlength{\oddsidemargin}{0.5in}

I haven't marked this as an answer as I think there still remains an issue with tufte-book.