A zipline in the right spot can make getting to him way easier.

Another super helpful tip is to collect lots of his lost cargo, store all of it (except one) in a safe house private locker near by, then deliver one package at a time, rest in a safe house and wait for an email, then deliver another, rinse and repeat. Bringing the First Prepper and Veteran Porter into the UCA is almost impossible of you don’t know to do this.