Nikita Malo proposes selecting the members of a constitutional assembly using sortition:
Why constitution, why sortition?
Constitution is central to political systems; it is mainly aimed to define power. Who make the new laws? What powers have citizens? How are chosen deputies? What are their obligations?
We do not know yet what the new constitution will be (even though it could be possible to define a new constitution first, and then to support and empower it), but what is crucial is that a constitution has not to be written by the politicians, or they will write their own rules, and so be able to take advantage of the situation. That is why sortition is supported in this article, as a way to avoid conflicts of interests. On that question, I recommend this video.