XeTeX ⇒ Character mapping (slots) of fonts

[yiorgosb]

I was given a .tex file containing the declarations of a mathsymbols in the following form

\DeclareFontFamily{T1}{mak}{}%
\DeclareFontShape{T1}{mak}{m}{n}{<->s * [1]Kerkis}{}
\DeclareSymbolFont{boldgreek}{T1}{mak}{m}{n}
\DeclareMathSymbol{\bfalpha}{\mathord}{boldgreek}{"61}
\DeclareMathSymbol{\bfbeta}{\mathord}{boldgreek}{"62}
...............

I include this file to the main.tex file of my article.

What I would like to do is to change just the declared font (Kerkis) to another
keeping, obviously, the same naming for the symbols, e.g.
the \bfalpha to continue correspond to the greek letter alpha etc.
For this reason I need the info for the slots of font.
How can I get this?
I looked in the corresponding afm, dvips, tfm etc. files of the font
but I found nothing relative to greek letters.

Thank you in advance