pretocmd{chapter}{newgeometry{margin=1in,includeheadfoot}}{}{}

documentclass[letterpaper,12pt]{report}
usepackage[margin=1in,includehead,includefoot,showframe]{geometry}
usepackage{lipsum}

pagestyle{myheadings}

% Remove includefoot option above and uncomment lines below to see patch attempt.
% usepackage{etoolbox}
% pretocmd{chapter}{newgeometry{margin=1in,includeheadfoot}}{}{}

begin{document}
chapter{Test}
Page number on this page should be in the footer and 1in from the bottom of the page.  Page number on the next page should be in the header and 1in from the top of the page and last line of text on the next page should be 1in from the bottom of the page.par
lipsum[1-10]
end{document}