Right now I can't find where I got the records that I have for another Elizabethtown, Leeds and Grenville family. They could possibly have come from a descendant, it was a long time ago.
A google search produced these results which may or may not be of use ,or you may have already done this research I have often found useful information from local historical societies , many of them will do research for a fee.
https://leedsandgrenville.ogs.on.ca/
http://www.grenvillecountyarchives.ca/genealogical-files.html has a Bissell file
http://my.tbaytel.net/bmartin/wsmart.htm, Bissell marriages includes 10 instances of the name Bissell
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://ontariohistoricalsociety.ca/wp-content/uploads/2020/02/Ontario-History-1904-v5.pdf
https://www.lynmuseum.ca/2019/06/11/genealogical-archival-boxes/ includes Bissell
https://archive.org/details/leedsgrenville00leavuoft/page/n9/mode/1up?q=Bissell
search doesn’t work but a James Bissell is listed on page 94 and 95, there may be more listings, it would require reading through the book
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://www.seeley-society.org/wp-content/uploads/2021/04/2016-aug.pdf
seems to be Bissell family history in Bloxwich, Staffordshire, England
chrome-extension://efaidnbmnnnibpcajpcglclefindmkaj/https://ontariohistoricalsociety.ca/wp-content/uploads/2020/02/Ontario-History-1904-v5.pdf
OHS papers and records Volume 5
http://www.rogerbissell.com/id21j.html maybe be junk
a David Bissell is listed on UEL website
https://www.wikiwand.com/en/Augusta,_Ontario, about Bisselltown, Ontario and Bissell Cemetery which is located along the Fifth Concession on Lot 34 near Algonquin, Ontario.
Another option is Facebook, sometimes it can be useful