You could make a script that prevents &#x2F;dev&#x2F;urandom from being made available until &#x2F;r&#x2F;random stops blocking, to then also simultaneously create that symlink.<p>Edit: on boot, first prevent access to &#x2F;dev&#x2F;urandom, then symlink it to &#x2F;dev&#x2F;random.
Then as soon as &#x2F;dev&#x2F;random stops blocking, reverse the direction of the symlink. 
Same improved security, much simpler to use.