> 1. Maybe there's a way with inline TeX to transpose one voice by an octave.

There is.  Here's the basic idea; this will transpose the second of two
voices down an octave. (Assumes use of \en to terminate \notes etc.)

\makeatletter
\def\vnotes#1\elemskip#2&#3\en%
{\noteskip#1\@l@mskip\@vnotes#2&\transpose=-7\relax#3\enotes}%
\makeatother

Bob T.

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