Creating a variant of Feeding Dependancy.

[CMEast]

Hey all, just wondered if I could get some help. I've come up with a new character concept, a Were-Spider, and the idea is that the PC has no control over her change. The 'monster' inside must feed at least once a month (or once every two weeks or something) and as the hunger grows, the PC finds it harder and harder to contain it. She must roll to contain it whenever she is in danger or whenever she is around vulnerable 'prey'.

I was thinking that perhaps every day she must roll discipline to keep the hunger at bay, if she fails then it increases by one. She can't reduce the hunger in anyway without letting the monster out to feed and the monster must eat a living creature (smallest is a puppy/small dog, worth one hunger point) before she can control it.
Also, whenever in a situation where she rolls to contain it, she automatically adds one hunger point to her stress track. If for any reason she wants to allow the monster out on purpose she can, but it automatically adds two hungers points to her stress track.

Do you think that works? I think it's harsher than normal feeding dependancy because she must kill to get rid of hunger stress and so I'd say it was worth at least [+2]. However it's a complicated variant and I can't help but feel there must be a more elegant solution. Any ideas people?
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Oh also, what do you think of this?

Horrific Beast Change [-2] - As normal beast change; however the change is particularly gruesome and brutal. Either your new form bursts out of your human body in a shower of gore and viscera, or your body mutates in an insanity-inducing display of ripped sinews and broken bones.
Effects:
As normal, plus when you change the effect is so shocking that people that see it must roll their discipline, if they fail they can only defend at an effective skill of mediocre for the PC's first attack that scene. (Alternatively, they get a fragile manoeuvre the PC can tag for free if the ambush effect is too powerful, for -1 refresh once per scene I think it's ok though).

[Deadmanwalking]

Honestly? That sounds like Human Form [+2] on the powers (or I guess +1 if you get them at will) and probably Demonic Co-pilot [-1] (at all times, not just when shapeshifted) combined with Feeding Restriction and a whole bunch of Compels on their High Concept (or a Trouble like "Uncontrollable Hunger").

[CMEast]

Well this is what I've got so far:
W

ere-Spider or Arachanthrope!

[-2] Horrific Beast Change
[+2] Human Form (Involuntary change).
[-0] Echo of the beast - survival instinct only. (so she doesn't commit suicide, has no actual in-game benefits, she represses her spider side as much as possible and so gets nothing else).

[-2] Inhuman Speed
[-2] Inhuman Strength
[-2] Inhuman Toughness
[-2] Inhuman Recovery
[+4] Catch - Silver

[-3] Claws - Venomous
[-1] Spider Walk
[+2] Feeding dependancy (HUNGER, custom).

[-6] refresh cost in total.

I looked at Demonic Co-Pilot but I can't seem to make it fit. All the spider does is devour prey and then wait for more prey, she wouldn't receive the benefit from it in anyway and her aspects and feeding dependancy will be compelled enough. Almost all of her aspects will reference her monstrous side and her attempts to fight it back.
Standard feeding dependancy works when, as a vampire or similar, you really WANT the powers and then you have to pay for them. This character is cursed by her power and only summons it up as a desperate last resort. I was tempted to come up with a form of demonic co-pilot that allows the GM to take over the character while it's a spider, with rolls to become human again every turn once the danger has passed; some sort of Jekyll & Hyde/split personality thing.

I'm just making the concept, not sure if it should be a PC or NPC. I just like the idea Thanks for taking a look though DMW. Hmm, it might count as at-will rather than involuntary though as she could in theory change at will, it's just that she would never voluntarily do that unless she's in fear of her life and even then she'll avoid it if she can, meanwhile she will constantly fight compels to turn in to the spider.