Controlling font size in math environment, fine tuning

Question

In my document using \documentclass[12pt]{report}, I have tables containing an index and a inequality in each line. As it's a long list, it's a supertabular with columns c|rcr. Sample data of one line is 1 & x_{i,j} & \leq & 0 \\.

Now, in this specific table, I prefer typewriter style. Additionally, the length of these inequalities is too high to fit with normal text size, therefore, I also reduce the font size. To have this in every math environment without repetition of commands I've declared a specific environment:

\newenvironment {specialMath} [0] {} {}
\AtBeginEnvironment{specialMath}
{
\everymath{\scriptstyle\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}
\everydisplay{\scriptstyle\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}
}

It works, in the sense that everything is displayed at the size of subscripts. However, printed on A4, this is a bit too small.

In summary, \textstyle is too large, \scriptstyle too small, but I do not want to adjust all font sizes (that can be done with \DeclareMathSizes{... in the preamble, afaik).

How do I fine tune the font size locally, not globally, in a set of math environments?

A minimal compilable example (pdflatex), without the table:

\documentclass[12pt]{report}
\usepackage{amsmath}                                 % math environment
\usepackage{etoolbox}                                % environment customization
\usepackage{supertabular}                            % multi-page tables

\newenvironment {specialMath} [0] {} {}
\AtBeginEnvironment{specialMath}
{
\everymath{\scriptstyle\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}
\everydisplay{\scriptstyle\mathtt{\xdef\tmp{\fam\the\fam\relax}\aftergroup\tmp}}
}

\begin{document}

$x_{i,j} \leq 0$ % normal style
\begin{specialMath}
\begin{supertabular}{r}
$x_{i,j} \leq 0$\\ % typewriter, slightly smaller
\end{supertabular}
\end{specialMath}
$x_{i,j} \leq 0$ % normal style again
\end{document}

Without the supertabular, somehow it's not typewriter font. It will be used in a tabular anyway, but you can ignore that fact.

Answer 1

I'm not sure about \scriptstyle; here's what I'd do:

\documentclass[12pt]{report}
\usepackage{amsmath}
\usepackage{supertabular}

\newenvironment{specialMath}
  {\footnotesize\everymath{\fam\thettfam}}
  {}
\AtBeginDocument{%
  \sbox0{$\mathtt{\xdef\thettfam{\the\fam}}$}%
}

\begin{document}

$x_{i,j} \leq 0$ % normal style
\begin{specialMath}
\begin{supertabular}{r}
$x_{i,j} \leq 0$\\ % typewriter, slightly smaller
\end{supertabular}
\end{specialMath}
$x_{i,j} \leq 0$ % normal style again
\end{document}