Basenjis being hounds are typically quite prey driven - in my experience. 3 of mine are extremely prey driven, 1 is still a baby so not sure about him yet - but he is more and more interested in rabbits, chipmunks, minks etc. as time passes, and that would be another problem with a small animal.
Mine don't have experience with having small animals around as pets, but I will tell you that 2 of my 4 basenjis can open dog crates (to let a playmate out), and 1 can open doors by turning door knobs, so even if a small animal were caged, it wouldn't be safe in my house. I have heard of many basenjis that can open crates & doors.
Not to make light of the question, but…In my house it would go down something like this: The basenjis are free in the house. 2 minutes later while I'm putting laundry in the machine, basenjis are missing. Liyah opens the door to the chinchilla's room, Liyah, Brando & Ruby would enter. Liyah or Ruby would open the cage, let the chinchilla out, chase it and scare the living daylights out of it and then kill the chinchilla, leave it at the feet of Brando, mom walks into room with dead chinchilla and Brando would take the blame. Ozzy would wonder where everyone went.
All kidding aside, I think if there were any chance of it working, you would need to start out with a puppy with them together.