Honestly, from the perspective of my character, it wouldn't have gone too far differently from the cutscenes:
I beat T10-T13 after I finished the 2.5 story, so from a story perspective I beat coil without the Blessing of Light. In that sense, I like to think most of my strength actually comes from my Excalibur/Aegis Zeta.
I submitted my weapons before my meeting with Nanamo (but I wasn't searched beforehand...?) so my primary source of strength was taken from me, leaving me vulnerable. I would've liked to be a bit more alert to the act that Nanamo was dying rather than sitting there like a complete nonce - I am technically a sultansworn being a PLD main, and having the sultana die on my watch is very much a kick in the balls. I'd think I'd be a bit more distraught about it.
I'd submit to Teledji only to play along and gauge the situation; I already know the circumstances are far too convenient, I already know he's a scheming little bastard and I already know I'm innocent. At the same time, risking confrontation only strengthens their case against me.
Within the Feasting Hall, well, I'm not going to forget being manhandled by Ilberd, so I'm happy to bide my time on that one and kick his face in when all is done. Again, I'm not willing to risk confrontation in front of an audience. I'm still a member of the Twin Adders and I'm not too keen on starting an international incident. I like to think my lack of action is what caused Gridania and Limsa to turn a blind eye to things. I'm certian if I started brandishing my sword around (IF I HAD ONE) like Raubahn they'd likely be forced to be more cooperative with the Ul'dahns at the risk of being accused of harboring a known serial killer on top of everything else.
Once the audience had disappeared and ran off scared, at that point I would have loved to get in on the action, but at that point Raubahn had pretty much beat me to it. Wouldn't have wanted to get in the way of any of that, particularly when unarmed. I don't really think they were my fights to get involved in either - Raubahn's hatred of the monetarists and Ilberd are personal vendettas, and I get the feeling that he would prefer to settle the score with them himself.
When escaping, this is where I would've done things differently. Rather than spend a good 5-10 minutes on the Royal Promenade debating our next move, I'd have rather have spent those 5-10 minutes getting the hell out of there. The scions are a diverse group - how that group could fail with a PGL, CNJ, ROG, THM and a PLD when grouped together is beyond me!