The scroll segmentation looks like it'd be a very manageable task for distributed volunteer work too, at least as a kickstart if that's really the bottleneck now. Just a 100 or 1000 halfway dedicated volunteers (small by internet standards, for a useful and simple task) could make a big dent. Don't know how many scan layers are in a single scroll, but for instance Project Gutenberg's proofreading network has processed millions of pages, one by one.