Okay so here is a test of combining a nicely generated face of a sneezy Korean woman in a field of pollenating weeds with outpainting to make it 18+. The sneezy face was generated in DALL-E which is very strict with mature content. I was able to get it to show a little skin by saying that I want the woman to be wearing a tube top. You can see the output which I had fine-tuned and iterated a lot, attached in this post as the square image. Using that, I put it into Stable Diffusion (in this case SD1.5) with the Mosaic-Outpaint extension and went through a lot of generating and cleanup of the extended part of the image to get it to look decent as an 18+ image that is more full-body. The blending between the two can probably still benefit from some iterating, as the skin textures I get in SD1.5 with my loaded model checkpoints still seem more lifelike than the skin the the DALL-E generated image.
Overall though, this seems like a successful test of taking some very good sneeze content from DALL-E and using SD to make it 18+. Will do more of this in the future.