I hear ya Doug,
However, as I put in the first post, "the man" (hzjcm8) said double drain is fine on a healthy trans. So I did that last year at about 12k miles. I'll do a single change this year and it'll be around 30k miles, and that'll get a good chunk of the factory stuff out. Is it over maintenance, sure, according to "the man's" advice. Is it still a free country for now, yup!
Also, based on Alisobob's findings, who didn't do the hoot method, you should be good.
At the end of the day, it's all in what you want. I was in your exact same shoes last year. I was all set to do the hoot method. After reading more of the Allison's engineer's posts, as well as learning about the risks of sucking in air, I changed my mind and did the double drain and fill.
I changed my mind because I wanted zero risk of sucking in any air. We're just trying to caution you on that risk, and if you accept it, then have at it. There is nothing bad that can happen from leaving in some of the factory fluid. Bad things can happen with inducing air though. Good luck!