That is very nice. What you've done is essentially what I plan to do with the stock spur to convert it into an adapter plate for a custom 56T spur. The 56T is big enough to clear the teeth of the 48T so all I'll do is drill 4 mounting holes in the outer edge. It will look a bit like a 2 speed gear when done.

Your photos are very clear, thank you. Could you measure the diameter of the Hyper 7 diff casing please? I will keep this route in mind.