Falling paladins are already overseen and punished as fallen by the DM team. This is already covered, and has always been covered. You are asking for something which already exists. If you believe an individual should have fallen, then either the behaviour hasn't been reported, or it has, and the ruling disagrees with your opinion.
Titles given to paladins are either official, in that they are official titles granted by the state and therefore with oversight from the DM team already, or within the order themselves, and the order themselves is the one who has the right to grant such title, as it only applies and counts within the order itself. They have no consequence nor meaning otherwise, and merely grant the paladin a depth and layering to their personality. If it is an official faction, it is given with DM oversight. If it is not an official faction it needs no DM oversight whatsoever, as it conveys no benefits, unlike normal noble titles which do grant consider power, and do require oversight, and already have it.
Fallen paladins can no longer use any of their spells or abilities. This is mechanically enforced. Nothing they have works any more. There is no need to do further than that.
Paladins are restricted by their alignments, their oaths, their tactics, their obligations, the fact they cannot multiclass, and the fact they cannot reliably detect any stealthers (a major part of the server). They have a slew of things that both mechanically and roleplay wise that keep them in check.
This post and the suggestions you have given are based on ignorance of the reality of playing a paladin on Potm. Please research the class better before making assumptions.