

i’d guess that the digital processing is a well known change so you can account for it
after all, modern post processing on a phone afaik is done in the raw sensor data, so is using a lot more data than is actually stored in the JPEG: it probably leads to more information being available than if it weren’t done (more shadow detail rather than crushed blacks, etc)
perhaps simply putting something like cling wrap over the lens and moving it for each photo would be enough: adding some scratches and roughness that slightly changes each time you move it