A Swainsona, probably S.lessertifolia given the location
This is a good resource, for anyone interested in Kangaroo island flora, https://www.environment.gov.au/system/files/pages/d5a53ba2-2d7a-428c-8531-6f000ae2b9c4/files/species-sa-kangaroo-island.pdf :)
Thanks Tapirlord, I might use that list to import a taxonomy set for KI so we don't need to keep adding species one by one. Hopefully over the weekend.