MaryTTS can be used for this, which would be good because of:

1. It's already running.
2. It would give the same tokens as when the text is synthesized.

This would require making this functionality accessible, either by adding it to wikipseech_mockup or by (partially) making the MaryTTS server accessible.

/wikispeech/textprocessing/ can be used for this, like so:
http://wikispeech-tts.wmflabs.org/wikispeech/textprocessing/?lang=en&input=Blonde on Blonde is the seventh studio album by American singer-songwriter Bob Dylan, released on May 16, 1966, on Columbia Records.&process=tokenise

Could this be a good first task?

In T161512#3604020, @Sebastian_Berlin-WMSE wrote:

/wikispeech/textprocessing/ can be used for this, like so:
http://wikispeech-tts.wmflabs.org/wikispeech/textprocessing/?lang=en&input=Blonde on Blonde is the seventh studio album by American singer-songwriter Bob Dylan, released on May 16, 1966, on Columbia Records.&process=tokenise

New url
http://wikispeech-tts.wmflabs.org/textprocessing/?lang=en&input=Blonde on Blonde is the seventh studio album by American singer-songwriter Bob Dylan, released on May 16, 1966, on Columbia Records.&process=tokenise