From a legal perspective, why can’t you just call the renters your “roomates” ?
I don’t see the difference, really, between you living in the master bedroom or you living in the extra studio.
And you have an under-the-table, inside agreement that you will stick to the studio and they will stick to the main part of the house and share the yard. It could be awkward or convenient depending on the personalities, but they are just roomates.
Then, you can call it your primary residence but you rent a room to some people.
You’ll have to share mail, utilities, etc. just like roomates do.
