I’d start here:
Last I checked @Sebring was out of stock on his site, but you can pick up way more of the ingredients than you will use in the foreseeable on Amazon for not too much money. The only somewhat expensive part of the formula is the Silver Nitrate, but something like 5 grams will run you around $25 or thereabouts. Sodium Thiosulfate is cheap, and a couple pounds/kilo might cost around $20, which will be WAY more of that than you need for a lifetime of “reversing” females.
The one thing I would recommend with autos given their “deterministic” timeline is to get the one you want to reverse germed and developed a couple weeks ahead of the ones you want to actually pollinate, that way you have mature pollen to drop on less mature seed gals which will give more time for the seeds to fully develop before senescence.
I’m happy to help with whatever know-how I’ve got, but there are many here with far greater knowledge, so I recommend tooling around a bit, making yourself known (as you are doing) and you’ll find the real experts!
I’ll be interested to see how things progress, and glad to have you aboard the Overgrow train!