Tell me, what is the symbol on that little yellow contract that one clicks to become a Clanner? Go to a shop and check it out sometime. When you sign up to become a Clanner, you are signing up with the CoT.
As much as it pains me that you can't go back to being Neutral, I have to agree with this restriction. I'm a Neutral character at lvl 121 and as much as I appreciate the fact that you don't want to be a Clanner anymore, I can't help but think that at one time you decided to join up with them in opposition to Omni-Tek's ideals.
Stay with Omni-Tek and one can be considered as going with the flow. Somebody who works in a mine or cleans toilets for Omni-Tek can be relieved of any questioning regarding their political beliefs. They're just working stiffs. But ... sign up with the Clans and you have made statement that you do not agree with the ideals that Omni-Tek represents (or you just really like the splendor of Mort).
As for the incident in question, any Clanner present was in fact affiliated with the CoT and was in violation of the Tir Accord. Omni-Tek is obligated to treat you as an outlaw. It was actually nice of them to simply ask you to leave. The fact you got brutalized is unfortunate and should be brought up with the Council of Truth. I'm sure if Omni-Tek is as fair as they try to present themselves as, the Officers in question will be dealt with appropriately by Internal Affairs.
Want to RP this properly? Then complain to your own governing body to get a dialogue going between Radiman's people and Ross' people to allow select inter-faction social events to occur. Remember when Nixon had the U.S. ping-pong team go to China back in the early 70's? That is the only allowable context for Clanners to be present in Omni territory until the Tir Accord is ammended again.
Please remember that the Tir Accord is what stopped the last Civil War. I gave uncontested freedom to the Clanners to govern themselves unmolested on their alotted land. Blatantly violating it in some personal quest for the party life does not serve any inhabitant of the planet well. There's a reason the planet is not at war. Like two feuding kids who need to be seperated, there's a line drawn down the middle. You stay on your side and they stay on theirs.
Rubi'Ka is NOT at war. The situation is quite analogous to Berlin during the Cold War. You have Omni-Tek on one side ruling with an iron fist and the Clans on the other supposedly working more democratically. You simply did NOT cross that line unless you were SURE you wanted to stay there.