You might as well just delete the commands, in my opinion. I thought
you wanted people to use them. No one is going to spend their time
trying to bribe people, if all they get is a noble with a few skills
(all the nobles with great skills will be oathed anyway) and it costs
one as much as forming one's own nobles.
I think it's too late to do much more than you have done so far. I
think removing SWEAR will take away the worst of the abuses.