I was wondering if I could for example take an Odalisque in QK (who is a wildcard trooper) into either to a fireteam of two ghulams (cannot make haris'es normally) to a fireteam of two sekbans that dont have the haris skill (which normally can make a haris if a sekban takes the haris skill) Would it be legal to make a such fireteam?
Welcome to the forum! 1 is not legal, because there is no Ghulam Haris listed in the Sectorial chart for Qapu Khalqi. The Odalisque can be part of a Ghulam Fireteam, but Ghulams can't be part of an Odalisque Fireteam. 2 is legal, as long as a trooper has the Haris Skill.
1 is illegal as it doesnt respect the list of allowed fire teams (you're attempting to create a Ghulam haris, which you cannot do) 2 is legal as it does respect the list of allowed fire teams (you're attempting to create a Sekban haris, which you CAN do)