This is a simple enough question so I'll answer it.
You can adopt a wiki at Adoption:Requests. You won't be made the "founder" because you didn't found the wiki. You will be made an "administrator" and "bureaucrat" however, which gives you every single right that the founder has: blocking, deleting... the only thing you'll be missing is the "founder" sticker on your profile. Nothing else.
Adoption sounds like a really good idea in your case. You should make sure you meet the requirements, and then fill out a request.