My suggestions would be the following:
Follow 8th ed trends in the army books. This means 8-10 magic items, an army-specific lore (which may or may not be in keeping with the Bretonnian theme, I haven't decided yet), monsters/monstrous infantry/monstrous cavalry/big centerpiece mini (or, in this case, things to deal with those monsters), core and signature units generally remain unchanged, army wide theme rules (Animosity, Ambush, Undead, and in this case, the Blessing) are tweaked but not fundamentally changed, etc. I think studying the existing 8th ed books is a great start to this. Also, look over the universal special rules for inspiration.
The magic items should give them fun and unique toys that can't be "made" through any other means (such as combining mounts, magic, common magic items, mundane equipment together.) Some should be pulled from the existing book, some could be new. An example of a good items to keep would be Prayer Icon of Quenelle or Gauntlet of the Duel; these play into the Bretonnian rules and themes. Example of poor items to keep would be Lance of Artois or Armour of Midsummer Sun; these are offered through other means, such as virtues or existing common magic items.
The Blessing is quite good as it stands. 6++/5++ gives Knights a pretty decent bonus, especially the 5++. It means Bret heroes don't need to buy ward saves, and can instead focus on other item builds. What do you not like about it?
Exotic cavalry: I don't think it's necessary, since peg knights are pretty exotic already. Then again, I wouldn't have liked demigryph cavalry if someone had suggested, and I think they're pretty awesome. You could make unicorns a thing, I suppose. It fits better in the theme than lion cavalry. Also, to be fair, I think lion cavalry would be awesome in a High Elf army. The problem isn't the idea, it's that it doesn't fit with the Bretonnian theme. Again, I think peg knights are exotic enough.
Reasons the longbows don't work: they are lothern sea guard without the ASF, Citizen Levy, or spears. Also, for every longbow you can get 3 regular bows, which translates to better potential results in shooting and combat for the unit. The longbow unit simply doesn't add anything; it just makes peasant archers slightly less good for no real reason. Also, were full-plate archers really a thing, historically? That seems really unwieldy.
An example of a "big centerpiece mini" I mentioned earlier would be taking the Grail Reliquae and making it more of a buffing/support unit rather than simply a stubborn unit with a unit filler. For example, instead of propping up a dead Grail Knight - seriously, what noble family would let the peasants truck around their pride and joy like that? - have be it sort of a walking one-man mausoleum, where the Grail Knight's piety and virtue continue to radiate and affect those around it.
It's not that foot knights are bad. Mechanically, making them core plays into the current 8th ed trend of taking big blocks of infantry and eschewing cavalry. This is the antithesis of Bretonnia, who found their niche in cavalry. Moving them to rare (or perhaps special) makes them less fundamental to the army. Fluffwise, a Bretonnian knight without a horse is one of low or no status. Making it core implies that these knights are common. Do they still hold their lands like the other lords? Why are they so common?
Also, Bretonnian themes tend to be Arthurian (Lady of the Lake), cavalry-centric, quest for purity/honour/glory, hunting, monster-slaying, dueling, etc. Rules and fluff that deviate from this will most likely annoy the community. You'd get a better reception if you made up your own homebrew army independent from Bretonnians with the approach you're taking.


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