Take the time to either make CS or get the chemicals to make STS. If you're going to take the time to reverse a plant to make feminized seeds then do it right. For little more than the cost of one bottle of premade solution that may or may not work you can buy the materials to make CS or the chemicals to make STS and know you have a solution that's going to work. Both can be had for under $50 and will provide you with the ability to reverse hundreds of plants.