In order to turn a female plant male without stressing it out, all you need is some Silver Thiosulfate, also known as
STS. If you apply
STS to female plants it will modify their ethylene levels, which is the hormone in charge of determining the sex of certain plants.
Add your Silver Thiosulfate to 400ml of distilled water, so you'll have around 450ml of
STS. Make sure to shake quite a lot until it's completely mixed. It's still much too concentrated to apply straight onto your plants; take 100ml of the mixture you just made and add it to 400ml more of distilled water.
This dilute is potent enough to use . There are diy vids online also. Also available ready to use from ebay , etsy and amazon if you want it already to use.
This site i found is quite informative about STS.
Feminized seeds and STS
GL