I can contribute little to your quest but my sister Gail a Librarian and Antiquarium from the St catherine's area has sent the following reply to my request for additional information.
Please let me know if you wish to contact her for further information.
The only thing I can think of, off the top of my head, is that there is a complete index to the Harriston graves (which John and I visited this Sept) and it is held by the Harriston Public Library, and is from the Ont. Genealogical Society (OGS)....... she could get on the main OGS website (if you have problems with finding it, let me know) and then access the Wellington County OGS branch site and others -- Minto Twp, etc..... she may find info there. There are also many good Ontario Genealogical sites she may wish to link to........
certainy, anyone with that surname who moved to Chesley (directly west of Harriston by about a 3/4 hour drive) must be linked to ours. If you wish to have her contact me, by all means. Love Gail