My first instinct is to say, yes, understand the idea that you will not be sleeping regularly for the next few weeks. He will scream and need to go out every few hours, and scream more, until he adjusts. … its the cost of being a furparent unfortunately - exhaustion is just a part of the game.
I agree with the idea that he doesn't appreciate having his potty pads in his crate. His crate is supposed to be a special place, a den, dogs do not like to eliminate in their den and if you are encouraging him to use the pads he probably senses that. But equally I'm sure he tears them up because it's fun or to vent his anxiety from being alone.
As difficult as it is to keep in sight (especially when you are not sleeping at night) he is still a baby, and has lived his life up to this point surrounded by warm fuzzy bodies to sleep with.. now he is alone, he has lost his brothers and sisters his mother, everything that gave him security as a puppy. He has to learn he will be ok alone in his den, and that is definitely not a week long process, think more like weeks long. Have you considered buying him a snuggle buddie or something like it? It helps in the beginning to have something warm to sleep next to and that has a heartbeat like another puppy. Some dogs keep these buddies like "baby blankets" and play with them even when they are adults.
For me, I took Lycia out every 3 to 4 hours at night her first 2 weeks home with me, whether she had to go or not, I just took her out, she got the idea pretty quick (but not with out some angry crate peeings first ) I was broken and sleep deprived by the end, but she was housebroken in a jiffy because she almost never had a chance to eliminate inside. To add to that, I decided in the end she could sleep with me in bed… and I prefer it. For special circumstances I taught her to sleep on the chair next to the bed when I want to sleep alone. I just felt that, because she is crated during the day, it was too much crate time for her to be crated at night as well.
But all and all, you sound like you are doing a pretty good Job!!!! so kudos to you. With Basenjis, you just got to wait it out. Always keep in your mind, that you are dealing with a baby, human baby parents don't get much sleep either, however your baby will be far more independent in a very short amount of time. There is light at the end of the tunnel !! These are hard weeks, but it will get simpler.