If I may, I will start by answering your question and then I will yield the floor to my colleagues who know a lot more about this than I do.
My approach was to say let us take the opportunity presented to smash all the standards we are thinking of, because we are capable of doing things differently.
I have no idea about possible solutions. I spoke with some close family members earlier; they are people we have collectively at our service, who are probably super smart in their own fields and could propose good options. I really see this as smashing it and I do not want to create a traditional bank with the post office.
Now I will yield the floor to my colleagues.