Non-indexed instanced geometry

Is it possible to render instanced geometry without needing indexed data?

DrawInstancedPrimitives throws an error when not setting GraphicsDevice.Indices, and despite I’m almost sure the answer is no, I wanted to know if there’s a non indexed alternative that I’ve missed.

It’s not a big problem, as I’ve created a ‘dummy’ index buffer with values 0…N, but I’d rather avoid creating that if possible.