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Actually I think you have to be considered an ally now. I just completed faction quest for court of Blades two weeks ago, and unless they've changed it since then, I was unable to enter the court until I was ally.
It's possible, it's been a while and I am still in the process of getting allied with the Court of Truth, my final one.
Another point of interest would be that you can buy bigger houses when you are allied with any one court. Or rather, you can buy the license to get a big house. Very interesting if you intend to betray as this house doesn't belong to any city you can betray from, meaning you don't lose access nor have to deal with the possible huge storage problem.