That won't stick across reboots, and at that point, I think you can just rm /dev/random; ln -s /dev/urandom /dev/random.

But couldn't you put that in /etc/fstab?

You could. I also find myself binding /dev/urandom into /dev/random in a container FWIW.

I could do a udev rule to just mknod random with the urandom device instead.