Vyse was not “Perring’s editor”. There was no such professional relationship between them. The work was in all but name his own, as outlined by Smyth. Vyse chose to give Perring the credit, as he chose to name the chambers after people other than himself.
And this fantasy of fevered consultations between Vyse in London and Perring in Egypt is just that. It doesn’t work with the means available at the time. Consider Wilkinson choosing to publish in Malta. It could not be done at a distance. It had to be fast enough. It wasn’t—and don’t suppose we’ve forgotten that all of this is unevidenced speculation.
“The one thing Perring didn’t sanction during these changes . . .” Did you think before you wrote that? Clearly there are untold numbers of things he didn’t sanction: possible changes which weren’t made.
And Creighton—you imagined the upside-down ˤpr. Perring had no idea of what he was copying, so I’m scarcely going to say (let alone “insist”) that he imagined any such thing. All one has to do is look at his early attempts (such as this one) to see how he struggled with this material—and on his accuracy you rely.