Speaking from experience please stop now.
Prior to focusing on breeding not quite so impossible cactus plecos I kept the same group of clown loaches for over 25 years.
Yes the females cycle several times a year. Most of the time they 'reasorb' but if stressed white infertile eggs are expelled.
Are you prepared to do the calculations to properly tranquillize them so you can inject them without causing harm?
Are you prepared to try different hormones and combination of them to find the right combination?
Are you prepared to do several injections a day with the same fish.
Again there are calculations for dosages and for thinning the dosage so it will go thru a small bore needle without injecting a large of fluid into your prized loach.
This venture is not grab a loach, stick a needle in its side once, and sit back and wait. If it was then the information would be available. If you are not a professional it is highly likely you will kill your treasures.
In the end I chose to donate mine to the Shedd Aquarium where they still happily swim in an environment much larger than I could ever afford. My last two I donated to the Belle Island Aquarium.
Jim