Saving your code to file aa.ly, running convert-ly aa.ly > bb.ly
and:
$ lilypond bb.ly 
GNU LilyPond 2.25.1 (running Guile 2.2)
Processing `bb.ly'
Parsing...
bb.ly:1786:1: error: not a note name: Time_signature_engraver

Time_signature_engraver in the \MensuralStaff context
bb.ly:1786:25: error: not a note name: in
Time_signature_engraver 
                        in the \MensuralStaff context
bb.ly:1786:28: error: not a note name: the
Time_signature_engraver in 
                           the \MensuralStaff context
bb.ly:1786:32: error: unknown escaped string: `\MensuralStaff'
Time_signature_engraver in the 
                               \MensuralStaff context
bb.ly:1786:32: error: string outside of text script or \lyricmode
Time_signature_engraver in the 
                               \MensuralStaff context
bb.ly:1786:47: error: not a note name: context
Time_signature_engraver in the \MensuralStaff 
                                              context
Interpreting music...
Preprocessing graphical objects...
Finding the ideal number of pages...
Fitting music on 1 page...
Drawing systems...
Interpreting music...
Preprocessing graphical objects...
programming error: No spacing entry from Clef to `custos'
continuing, cross fingers
Calculating line breaks... 
warning: cannot find line breaking that satisfies constraints
Drawing systems... 
Converting to `bb.pdf'...
fatal error: failed files: "bb.ly"
$

I get the attached file, is that more in line with what you want ?
Perhaps, using a later development version instead of stable might
help you/

Regards,
/Karl Hammar

Attachment: bb.pdf
Description: bb.pdf

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