You could make a script that prevents /dev/urandom from being made available until /r/random stops blocking, to then also simultaneously create that symlink. E

You could make a script that prevents /dev/urandom from being made available until /r/random stops blocking, to then also simultaneously create that symlink. Edit: on boot, first prevent access to /dev/urandom, then symlink it to /dev/random. Then as soon as /dev/random stops blocking, reverse the direction of the symlink. Same improved security, much simpler to use.