No you can't have 2 male dwarf gouramis. They are one of the more aggressive species and in a tank this size one would bully the other to death. And a male/female pair might not work either as males are well known for bullying females if he wants to breed and she doesn't.
And there is still the problem of the iridovirus these fish carry.
And there is still the problem of the iridovirus these fish carry.