Has anyone successfully made this gluten free? If so what flour did you use?

I've used King Arthur Flour Measure for Measure, with great success - using oat milk instead of regular milk, and Miyoko vegan butter, as we needed to be this dairy free, too. It worked well! I must say though that I generally use much less sugar than what is called for (1/3 cup), as we have found that the sweetness in even 1/2 cup of sugar overwhelms the peaches, especially one that's are nice and ripe. ;o)

I have. I’ve used Cup4Cup.