Frankly, I don't have an opinion on the best approach to take since changes have been made to the Standing Orders in a variety of ways, including the one you just described.
I see that Mr. Reid is in the room. Just recently, he successfully had the Standing Orders changed by way of a private member's motion. Any method is acceptable. Of course, changes to the Standing Orders are more likely to work well when a consensus has been reached, but historically, changes to the Standing Orders have been made in a variety of ways, and not always that way.