Wikitree has a project for that called Adoption Angels. There's more information here: https://www.wikitree.com/wiki/Project:Adoption_Angels
The people who work in the project are experts at using DNA and building out trees to figure out who is who.
I would recommend getting in touch with the Adoption Angels project - this is the sort of thing that is right up their alley. See their info page here: https://www.wikitree.com/wiki/Project:Adoption_Angels