Option 3 seems the best. At the end of the day there is no real issue with Class 3's being in the server, it feels like the combat focused area of the server is being restricted for no reason. There is no reason that more roleplay focused players and combat focused players can't co exist on the server at the same time. Just make separate zones for each/implement rules .
I personally haven't played 6.0 yet however have got the mods downloaded but I already know I would enjoy the server a lot more with Class 3's as I focus on combat more than roleplay.
In general I am unbothered with what happens as it will still be good craic but I feel that a lot more fun would be had with Class 3's being in the server.