Here's an unrelated suggestion.
When you use \wordcompress with a value which triggers the warning, the
music function doesn't return music, so you end up with a fatal error
(rather defeating the gentle purpose of a simple warning!)
Why not something like:
wordcompress =
#(define-music-function (parser location num) (number?)
(cond
((> num 0.5)
(and (ly:warning "Attention: 0.4 is a rather large value for
\\wordcompress already!")
(make-music 'Music)))
((< num 0)
(ly:error "\\wordcompress should get a non-negative value."))
(else #{
\override LyricWord.after-line-breaking = #(lyric-word-compressor num)
\override LyricHyphen.minimum-distance = #0
\override LyricSpace.minimum-distance = #1
#})))
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