Thank you so much for sharing this. It was such a delight to read.
I think it is so awesome you are going to do this or just taking the steps to make it happen.
What you have to share is it experience of staying sober just like you have done here. And it's your experience.
That's the thing about AA is that while we all have the 12 steps we experience the results of these differently but the basic result is generally the same - sobriety.
They'll be things u've experienced in your sobriety that will help others (in that treatment centre) just like others have helped you by sharing their experience.
I am excited for you. What an awesome opportunity!