One of the authors of the book The Real Professor Higgins kindly sent me scans from a book called A Sechuana Reader published in 1916 by Jones together with Solomon Tshekisho Plaatje. It contains a set of reading passages together with literal translations and phonetic transcriptions.
English translation of reading text no. VII with the proverb at the end.
Phonetic transcription of the Sechuana version of the proverb.
Title page of the Sechuana Reader.