Sounds like it would be easiest to stat as a regular lycanthrope, add in Demonic Co-Pilot with "Rage" as it's pourpose. And if you would like more power pick up Modular abilaties and use it with whatever special effect you would like.

The ungrading of powers should be no big deal. On YS91 it addresses alteing character between sessions, if not between sessions, as a GM, I would rule that you would need the full amount of refresh for the new power to do the upgrade; i.e. you are wanting to upgrade from inhuman (anything) to Superhuman (anything), so to do so mid session I would require the full 4 points of refresh needed to accomplish this (or an inventive use of a temorary upgrade option) of course this would then free up the 2 points of refresh previously used to purchase the inhuman power. The power desription for superhuman powers clearly state that they replace thier inhuman equivalents.

And mechanics for the narritive directly modifying your character. Not sure what other games your have played but in them it is extremely uncommon for the creation of the character's story to be the main aspect of character creation and then directly tie that into what your character can do in game. For most games that is just fluff. And I agree that most powergamers are masters of the rules and being a powergamer doesn't neccessarily mean that you are not a good gamer, but it does generally mean that your deftness with the rules is used to manipulate power levels (in game) to your favor.

I believe I would set it up as a normal Were creature with the hybrid form being the primary "were-form" then pick up a -1 upgrade to the Beast Form power simply allowing another form but I would suspect that the skill set of the Half-human form and the full animal form would be pretty similar. In that situation I would cover the having of 3 forms threw the use of character aspects.

I don't believe that I would charge a refresh. I would simply treat it as a unique power using the mechanics of Incite Emotion as the mechanics of the new power. I believe that is the best way to maintain balance. i.e. to simply take existing powers and rework them to fit the story of your character. But, say, if I were to take a White court Vamp and give him/her the ability to use a different skill to control their standard set of powers with, then yes I would definitely require a stunt for the skill I would be using. You could maybe justify accomplishing the same thing with a unique use of the "Echoes of the Beast" minor power. Say a Vampire that focuses on feeding from minor talents therefore morphing his power into something more akin to sorcery or Channeling creating a type of focused practitioner. Taken to it's logical conclusion that could be totally awesome.

Seems to me like the simple fix would be to use Debt like in Sponsored magic and Demon Co-pilot. Rather than making it a hard rule use it to fule the story. Even using the Demon Co-pilot power to represent the Po (Beastil Demon) &/or The Hun (no compassion /humanity) would seem to work well. Existing mechanics should serve well for inforcing the goal of these two aspects. I would run the Yin/Yang dicotemy based on aspects of the character and the persons prefernce in his/her character. Also the GM could compel the character to take Living Dead as a temporary power with debt, especially when being taken out or force the character to take the power (like becoming a red court vamp or a changling no longer being mortal) as a resolution to being taken out.
      So it looks like it would work well if you would adjust the musts for the power to include "Demonic Co-pilot" and an aspect depicting the characters stance vs. Yin/yang balance. So I would go with: Demonic Co-pilot (-1); Human Form (Involuntary Change +2) affecting Living Dead (-1) & Gaseous Form (-3); Blood Drinker (Qi Drinker) (-1); Feeding Dependency (+1) affecting atleast 1 Inhuman power (-2) for a total of -6 Refresh. If you were to become an Emotional Vampire just do an aspect swap and switch out the bood drinker and Emotional Vampire powers.
    All in all I really like this. Thanks alot for posting the Ideas. This is a really strong concept.

To stick with the blade motif you could go with a katar or a pata. These are both gauntlet type blades. As for the remaking of the blade. Well If the powers above deem it necessary I'm sure they can arrange whatever they want to. Especially if one or more of the blades are out of the fight and they are needed immediately.