The problem isn’t so far from that of BTs, and here everyone agrees that they should be matched with their own.
As a Ba’al Teshuva who married someone who is FFB, I can state with absolute confidence that NOT *everyone* agrees with your statement. I have been married for 21 years to the finest spouse a person can have and have three wonderful children of this marriage. I can tell you that a marriage between a Ba’al Teshuva and someone who is FFB can work and produce a perfectly fine Bayis Ne’eman B’Yisroel.
Furthermore, in this age of the shidduch crisis, I find it utterly mind-boggling that you are seeking to *further* limit the number of potential marriage partners for any specific individual.
In addition, think about the message that your statement sends to potential Ba’alei Teshuva: “yeah, you’re welcome to come… until you want to date my daughter — then I don’t want to see you.”
The Wolf