exam/extsizes: How to create a new .clo file for unavailable font-size?

Question

Following up this answer, how can I create a font size that extsizes doesn't have?

In other words, what should be done to create, for example, size12.clo out of the existing size9.clo and size14.clo? Or how to create size32.clo out of size20.clo?

\documentclass{exam}
\usepackage[20pt]{extsizes}

\usepackage{showframe}

\begin{document}

\begin{questions}
 \question First Question
 \question Second Question
\end{questions}

\end{document}

Answer 1

Thanks to that comment, the versatile package scrextend can easily get the job done.

\documentclass{exam}
\usepackage[fontsize=32pt]{scrextend}

\begin{document}
    \begin{questions}
        \question First Question
        \question Second Question
    \end{questions}
\end{document}