I think that allowing married couples also to help monitor and give advice might help keep some of the weirdos more at bay... I know a lot of traditional Catholic married people helped me in that regard back when I was trying to determine how to know what people I could trust online to later talk to privately. 😅
The hypothetical married people would have to A) have enough time, not super busy raising a natural-sized family, and B) at a place where there's LESS risk of getting involved with a young single person.
Both of these points suggest that any married persons involved should be in their late 50's at the youngest. You need time, and time is in short supply when you have "kids under 5" in the house. And the married persons would have to be grandfather/matronly figures, so that the young people wouldn't be too attracted to them on a natural level. There's no way to bring the risk to 0 on this heading, only to minimize and limit the risk.
But remember, there is such a thing as risking for a good cause. Even one's very life can be risked for a just cause. Back in the day, most babies were delivered by midwives but whenever there were complications, they called in a "doctor" who was invariably male to perform a C-section, for example. And to this day, doctors are exposed to temptations that most men are not. The same is true, to a lesser degree, of many other professions that closely work with the public. (Think: A/C repairmen. Going to peoples' homes, often while the wife is there alone and the husband is at work...) That's why Catholic doctrine distinguishes between NECESSARY and UNNECESSARY occasions of sin.