My suggestion is to not worry about it. Implement pure geomipmapping (which I consider easier than geoclipmaps) with 1 drawcall per batch. Then eventually iterate. Doing superchunks is surely not trivial.
It doesn't need to split buffer objects on the fly. It's just a matter of playing with index values smartly and modifying drawcall data.
But again, I suggest to start simple and scratch your head after you are sure you got a problem with draw call count. I am serious about that.