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Actually, I found sympy to do almost exactly what I want, with:

   sympy.latex( e, mul_symbol='times', symbol_names=d )
   

where d is a dictionary of symbols -> numerical strings mappings. sympy might turn out to be just enough for my purposes, though I still would like to know if this is possible with a reasonable (i.e. small ;-)) amount of work in sage, just in case.

Basically I have a small number (3-6) of mostly linear eqns to solve where the variables to solve for are not known ahead of time. I'm generating worked out examples of equilibrium eqns for students.