Yeh, I have thought about having it as a second middle name. I thought that this would be a lot easier on the child too than having it hyphened. It might also be an idea to have the surname without the hyphen, then it would be easier to be able to "drop" one if they want to.

I do worry that I may appear to be a bit of a hussy too though as Arimeh mentioned, or appear as though I am not the mother to the kids because my partner and I are not married (and probably won't be for a long time, if ever).