It would be nice, but the demand would need to be there, at this point, it would be hard to recoup the tooling costs. You could make your own.
Among the problems of utilizing BB30 in a lugged type BB shell is the post machining necessary, BB'd distort a bit, there are no parts that can be modified to help make things work, (such as spacers between the threaded cups and the bearings) The "press fit" region must be paint free, so rust will be a concern at the "edge". Yes, stainless steel and or a bevel can address some of this, just design time.
Still, outboard bearings are a workaround that is the band-aid approach. An larger diameter shell makes fitting big diameter down and or seat tubes easier...