I am also trying to figure out how to do this. I have never found a satisfactory answer. There was one person who I believe managed to make a modified version of the engine that could support this, but he lost his entire project, and he never told anyone how he did it. (I even emailed him with questions and never got a response back…)
I’ve been at my wit’s end for months. I sort of gave up even thinking it might be possible, but seeing how undesirable the alternatives are, I’ve been once again thinking about what it might take to get this to work.
Unfortunately, the chances of my being able to do this without help are just about nil.