Dealing with character space issues in feta font

[Carl Sorensen]

The shape note community has asked for improvements in shape note heads,
because the current system creates "goofy" looking output.

See <http://code.google.com/p/lilypond/issues/detail?id=602> for more
details.

In modifying the font, it now appears that there are at least three
different styles of shape note heads:

1) Sacred Harp style
2) Christian Harmony style
3) Southern Harmony style

In order to accommodate all of these styles, it made sense to me to add some
new glyphs to the file mf/feta-noteheads.mf

Unfortunately, when I added all the necessary glyphs, the upper index in
mf/feta11.log wrapped around to 4, so the font was broken.

Is there a convenient way to repackage the characters for the font?  I could
decrease the start number (which is currently at 32 in order to avoid the
control characters, IIUC). Should I do this, or is there some other way to
split the font, e.g. by moving one or more groups into a separate font?

Thanks,

Carl