It is possible. Pheidologeton diversus often mate inside the nest or just on the ground above the nest. It doesn´t seem to be important to fly or not to mate with their brothers/sisters.
The problem is, what everybody who ever had Pheidologeton diversus can confirm, that small colonies are extremly hard to keep.
It is nearly impossible raise colonies from about 500 workers, what in the most other ants is a colony that nearly can´t die of bad keeping.
Pheidologeton diversus queens are so much bigger than the normal workers that they need hundrets just to feed a queen.
I´m not even sure if a queen can found a colony solitary, I think new colonies might only come from spliting of colonies and adoption of new queens.
But as I said the mating isn´t a big trouble, you could say that the queens get raped by the males as seen in this video;
Hyperlinks sind nur für registrierte Nutzer sichtbarSo the main problem and the cause because nobody breeds Pheidologeton diversus is that the queens need workers, wich you would have to take from your colony. If you do that to much your own colony gets to week and the colony dies.
Besides Pheidologeton diversus is just extremly hard to keep and nobody can really figur out why.