It is so interesting because I was engaging with you in a good faith, laying out an argument about why this might be more straightforward then you are letting on. But you called my argument imaginary and then called the instance I am a part of a garbage heap? Who is being uncivil?
I have been looking into cryptpad, but I don’t know if it is really secure/private, but it appears to be a privacy-oriented, self-host able google doc alternative: https://cryptpad.org