There's a lot AIO devices these days. I'm not too familiar with them, but they seem to be patterned after the Billet box. I read terms like: "Boro" or "Bridge" but it sounds like what you're looking for. Vandy Vape made one called the Pulse AIO (I think?) Lots of companies have created their own versions. They make different rebuildable things that go inside of them. Some are pretty expensive, some probably not too spendy.
A lot of people love those devices. I've declined to try any so far. It's supposedly one of those rabbit holes people can get into.