"If you say you're going to do something and you start to do it, and people enjoy it or respect it or are entertained by it, people will step up and help you."
Google the quote to see who said it.
I have no idea about the US real Estate market but private mortgages between the existing owner and buyer are quite popular here they are legal contracts and pretty much like your option 1 suggestion.
The other way could be a land bank style company
One of the main problems is going to be trying to keep any sales within the community so it is bitcoin only
In bold, I have a solution. Coming soon!