Let me answer that one in a non-flippant attitude. Each point so raised
This is addressed to your post, and there will be a separate post for others as appropriate.
We cannot, if the editorial 'we' is permitted, have our cake and eat it too.
Pakistan either recognises that the Maharaja's rule was legitimate or it does not. The consequences are simple - starkly simple.
If the rule of the Dogras was legitimate, then the territory of Gilgit is in armed rebellion and is liable to be reconquered with no legal consequences whatsoever; the dispute over Indian sovereignty has been a very effective red herring over the decades, but ultimately, it boils down to the transfer of power: who was entitled to transfer power, and to whom did that entity transfer power?
If the Maharaja was an illegitimate imposition on the people of Gilgit, its people had - have - a right to throw off his rule and declare themselves independent. If they had a right to do that, then joining or not joining a third country is well within their rights.
However, nobody declaring themselves an heir to the Dogra rule can insert themselves into this space. If the Maharaja's rule was illegitimate, it cannot be inherited (=devolved). There is no question of the declaration of independence by the people of Gilgit and the assumption of ruling rights over that territory by the self-declared government of so-called Azad Kashmir co-existing. Either one or the other must prevail.
If the rule of the Dogras was legitimate, to go back, then the transfer of power by him was likewise legitimate. He himself 'divided' his sovereignty - a perfectly admissible procedure, for instance, under European feudal law, and gave the Government of India his rights in respect of military establishment for military action, of foreign relations and of communications.
The claim of the Azad Kashmir government to hold his powers is nonsense. The constituents of that government had no locus standi in the Vale or in Jammu, or in Ladakh, Baltistan or Gilgit; it held only local power in the trans-montane area of west Jammu. It had no representation or military presence in Baltistan, in Ladakh, in the Vale or in Jammu (east Jammu). Certainly the rules of the transfer of power to the two Dominions of India and Pakistan had absolutely no provision for accepting a self-declared transferee as a satisfactory substitute for the Maharaja's nominee, nor did any interested party have any authority to designate that provisional authority of a province in armed rebellion as the proper administrative authority. So the headache that the Government of Pakistan has, deciding how to pry loose Gilgit from Azad Kashmir is a non-issue, shall we say.