I'm uncertain an Xara product would be the correct product for playing in the 3D space while desiring to have the highlights on the gold fill. 3D in an Xara product is rather rudimentary and the lighting it has would "fight" against the built in lighting of the fill.

I think I would work the other way around (because I have and know the two products in question). I think I would produce the paths filled with color in XDP, do the 3D for the "presentation" I liked, then export as a PSD for opening in PS, redo the fill there (unclear as to if you are using a plug-in or not).

Ultimately, this could/should be done in a actual 3D application.