Selecting Staff Size by the Font Size of the Lyrics

[Br. Samuel Springuel]

I like the ratio of staff size to the size of the lyrics that lilypond 
normally uses.  However, I have to print out some large format scores 
for a confrere who has vision problems and thus need to increase the 
size of the lyrics so that he can read them comfortably.  I know from 
past experience that a 17pt font is comfortable for him to read.

Is there a way to tell lilypond to select the staff size so that the 
accompanying lyrics are printed at 17pt?  Or do I simply have to play 
around with the staffsize settings until I find one that gets the lyrics 
to approximately the right size?
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Br. Samuel, OSB
(R. Padraic Springuel)

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