I know about Dorylus colony in formicarium ... I have some videos from it , there male swarming with queen and videos how dorylus queens laying eggs etc.
and army ants? ... you can keep Polyergus :) , it is nice European army ants and now in June we have a lot of theirs hunting here
What you say about Polyergus you could say about many Formica, as these hunt in swarms and trails. The only real difference is that Polyergus need slaves to survive which would make Formica easier to keep. Although, they do look like bloody nice ants.