Newgeometry and afterpage don't adjust the geometry

\documentclass{article}
\usepackage{lipsum}
%please, no:-)\usepackage{afterpage}
%\usepackage[bottom=5cm]{geometry}
\begin{document}
\enlargethispage{-5cm}
\lipsum
\lipsum
\end{document}

afterpage puts it argument in a group and then (most of) the settings of \newgeometry don't work as you can see here:

\documentclass{article}
\usepackage{lipsum}
\usepackage{afterpage}
\usepackage[bottom=5cm]{geometry}
\begin{document}
\lipsum
\lipsum
{\newgeometry{bottom=1cm}} %bottom ignored
\lipsum
\lipsum
\newgeometry{bottom=1cm}
\lipsum
\lipsum

\end{document}

After searching the entire internet for a solution (the ones listed here did not work for my setup), I finally came up with this one:

%setup your default geometry:
\usepackage[a4paper, left=2.3cm, right=2.3cm, bottom=2.0cm, top=3.0cm]{geometry}

%use this package to get the "on-every-page-do-this-Hook" below
\usepackage{everypage} 

\begin{document}

%this line registers the reset-hook:
\AddEverypageHook{\ifnum\value{page}=2\restoregeometry\else\fi}

%and this line sets your special geometry which is cleared by the hook above on page N (with N=2 in this case)
\newgeometry{left=2.3cm, right=1.7cm, bottom=2.0cm, top=9.7cm}

EDIT:

After wrapping up my proposal to a compilable example spanning several pages with lorem-ipsum-text I found it actually not working properly!

So, instead, the afterpage-package in combination with \globaldefs=1 seems like the way to go here:

\documentclass{article}
\usepackage{lipsum}
\usepackage{afterpage}
\usepackage[bottom=5cm]{geometry}
\begin{document}
\afterpage{\globaldefs=1 \newgeometry{bottom=1cm}}
\lipsum
\lipsum
\end{document}