30 samples doesn't take that long to render. I was doing test renders with just James (the clothed figure, changed his shirt to red), about 600 by 400 in size, and it was less than a minute to render.

Rendering with DV=0 and SV=0 won't save any time. Even if it did, compositing in post would be impossible - you need to add the Gather effect, so you'd have to make everything else BLACK in order not to double it, which then would make it Gather nothing at all.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)