Instead of AO, you could reduce the Min Bias of the mapped shadows. Use the shadow cams to make sure that they always look at the complete scene (but not from too far away, that makes the shadow maps chunky).
Use as few lights as you can get away with. Filler lights can be emulated using ambient color settings (which is also a good way to light up the eyewhites).

Or (but that takes a lot of fiddling after import) render in Vue. Vue can import entire Poser animations. It needs quite a lot of material tinkering before it looks like you want it to look, but after you're done Vue renders MUCH faster than Poser.
If using Vue 6 Infinite, you can even use polygon smoothing, just like in Poser. Vue 6 Infinite is cross-platform, comes in 32 bit and 64 bit flavor on the same disk, and comes with a 5 node render farm license.
But it is NOT cheap. www.e-onsoftware.com

The pen is mightier than the sword. But if you literally want to have some impact, use a typewriter

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