Everything that I've been told and read, points to growing them up in individual tanks then putting them in a divided tank to try to pair them. Once the pair bond is made, it is most likely very strong.
i say give it a go.
you really have nothing to lose. i will re-iterate that you should keep them individually or divided. they are not as mythical as people might make them out to be. it's only when you stuff 10 juveniles into a tank then the crazy bloat issues start. i remember when my trio were small enough that they kept slipping between the spaces of the divider to get at one another. it was relentless. every morning i would wake up to find one female on the other female's side of the divider and one of them was hiding and breathing really heavily behind the filter. she would be all black and looked seriously stressed. i would immediately separate them and eventually made my divider such that they couldn't slip through the cracks. the fighting ended by default and the trio did very well after that. did nothing more than massive water changes and two feedings a day. i eventually got a pair and gave the other female to polomax, who is reporting that she is also doing well and is getting a small bump on her head