Polaroid Enlargements in Darkroom?

Hi,
Wondered if anyone had tried using a wet darkroom work flow to enlarge a Polaroid or Fuji Instant image?
I've read about people using a scanner to copy the peel away print or paper negative and then print from that scan, but what about a good film based copy negative and then print from that?

It should be like any straight copy work from a flat opaque original. Generally you want to do it with medium format or 4x5", a slow, fine grained, relatively neutral film, two lights at 45 degrees to the work. I'd try Portra 160NC, since it has a similar color palette to Polaroid color materials--kinda pastelish.