Harmony DOES allow you to change the font used for the lyrics. I may have to check that it automatically calculates the space using GetTextHeight.

BUT it also has a facility by which you can display the note names (in abc form) instead of the lyrics, so you wouldn't even have to include a lyric line in the file.

It may have to be tweaked a bit, as you say, for accidentals and especially implied accidentals (as in the key signature) though.

I think I did receive your font, but haven't done anthing with it yet.