"If there was they'll likely not be as ideal in time."

Because so far, of those that have made it this far, few of them have been exactly as they were when memories were returned.

"If nothing else instructions have been created for the event I can not keep up with demands or become unavailable long term."

Meaning he's just going to create enough and varied call signs until he gets help or he ends up lost or dead, thus making one of the many notebooks he's creating needed for someone else to keep it going.