That is a really good strategy. I am going to do that with my gelding. He was rushed in his training as a 'quick-sell' when my innocent eyes bought him. He was never even lunged or ground driven. They just slapped a saddle on him and put a bit in his mouth so that's how he learned to be ridden. So the poor boy is hard-mouthed. They would also beat him with a crop and kick him in the sides to go, an unfortunately, had me doing those same things.
I learned since then, and let me tell you, I feel horrible knowing I caused a lot of his behavior, but didn't know it at the time. I am going to start back from square one with him, he is 3 1/2 will be 4 in April. They broke him and did all this stuff right at 2.
I will definitely try those methods with him becuase he doesn't stand still at all, not even for mounting. Thanks for explaining!