can you test with:

\unexpanded\def\unicodeglyph#1#2% watch the double mapping

 {\begingroup

  \getvalue{@@\currentucharmapping\strippedcsname\uchar}{#1}{#2}%

  \bodyfontsize\unicodescale\bodyfontsize

  \font\unicodefont=\truefontname{\unicodestyle\unicodeone}

    at \currentfontscale\bodyfontsize

  \unicodestrut

 \unicodefont\unicodecharcommand{\char\unicodetwo\relax}%

  \endgroup}

i'll change the handlers in not applying a strut by default