I look forward to seeing it. I've been thinking about going "dual" head. Until then, I might try doing what you are doing a bit. Post some photos after you get it going.

I want to make a part, insert some wires and reinforcement, and then seal it in. It's not brain surgery I don't think. I need to find the Cura plugin you are talking about. It might turn out to be pretty simple. I worry about the already laid down layers cooling off too much and then the new layers not sticking. Is that an issue do you think?