It's interesting that you describe your use case as "very specific" now, but earlier it sounded like a thing that that thousands of other people might do simila

It's interesting that you describe your use case as "very specific" now, but earlier it sounded like a thing that that thousands of other people might do similarly. What makes you not want to do things their way; what makes them not want to do things your way? It sounds kind of like Airbnb/Vrbo but without the expense and protection of a well-paid middleman, in which case I'd expect lots of people to be interested.