Can bengals and Savannahs live together? Yes! The Savannah will get larger than the bengal. And having two hybrids like that -- the energy will be crazy! You'll have to make sure your home is catified. I don't know that I would get a male because hybrid males are highly territorial. A female may be a better fix. I still say your bengal may not be bored. You need to spend a lot of time with him and another cat will not necessarily replace that bond. You may want to watch this video and see if this is what you hope for with the cats.
https://www.youtube.com/watch?v=FLqeVfneEr8