While this is not one of the 7200 scanners claimed by VueScan[1], it might be worth talking to those folks. With their experience they might be able to reverse-engineer the protocol.
If not (and I'm sure this is not an acceptable idea to a purist like OP) I would consider using a good consumer-grade scanner and post-process with Topaz AI[2], which produces absolutely astonishing results in my experience. Yes, maybe it is inventing the pixels it adds, but they look like the right pixels nonetheless.