What a load of
. If you have time to tell EVERY aircraft you put onto a vector the reason why then you have time to double your workload and shift more aircraft. I cannot see in your list "Vectors to avoid mid air collision" or anything else that is appropriate so already your book is flawed.
In the UK (and I think everywhere else now) the new RTF procedures are quite easy and defined and mentions resuming "flight planned route" after 3 minutes of selecting 7600. In reality most switched on controllers will just keep everything out of the way and not expect anything from the comms failed aircraft so that whatever it does will not cause too much alarm.