I respect your views and the passion you poured into this proposal, but I shall remain adamant in my own opinion. As I repeated numerous times, lore and strategy are not what I question. My major argument in opposition to this concept is another one, substantially different from lore or strategic points, which you never addressed in your replies. The idea of bringing the most important heroes of the Blue Mountains (namely, the whole Dwarven Company) in another faction (albeit the temporary connotation of the spell and the references to the lore) is exactly what I find ill-conceived in principle. In light of this issue, the comparison I made concerning Galadriel or Sauron does represent a valid reasoning, alongside the lore accuracy of such hypothetical summoning spells; because lore arguments could well be brought as proper points in favour of that hypothesis (and, I would say, even the cinematographic atmosphere). Game-based uniqueness is eventually what your suggestions might disrupt. The fact that each faction is supposed to retain most of its own unique concepts as its exclusive possession can legitimately be considered one of the customary principles of the Edain Mod.
As for the hero-battalion system, you seem not to have grasped the exact reasons at the root of my position as well: I never stated that the Dwarven Company (whose characterisation is centred on the unity theme equally) doesn't deserve this feature, or that the implementation you propose wouldn't do justice to the lore and the films. Since a good faction already disposes of this possibility and an evil faction of its counterpart, it would go against differentiation and uniqueness to have a third replica of the hero-battalion feature in the game. And I would add that the Fellowship of the Ring is quite a different of a case from the Nazgûl, as the latter case basically consists of the repetition of the same model (while you can play an extreme diverse set of heroes with the Fellowship). And, the Fellowship belongs to the exceptional realm of Ring systems; something that makes the concept even more unique in itself and that convinces me of the necessity to keep it so (without other replicas whatsoever).
As I explained, the very inclusion of Thorin's armour was a compromise born from very divergent views, when part of the Edain Community and the Edain Team was not very sure to make it an actual concept of the game. One is hardly ever fully satisfied by compromises, but the value of a compromise is exactly due to the lack of other reasonable alternatives (and of the existence of a heated plurality of opinions).