the Warehouse would be deadly if she tried to show up right now...
Hmmm.
I was thinking, if you gave Sarah a key right now, and then a warning that the key should not be used because the Warehouse was exposed to the Void and highly dangerous and might even kill her just from standing near an entrance, Sarah seems like the kind of person in the kind of position that would have her immediately start thinking about how to weaponize that.
Adam's subconscious is blocked from spending CP, but trying to get around that restriction seems like something it might try to do based on his personality, and Adam seems like the kind of person that might hesitate to retract upgrade options offered by his subconscious even if he thinks they're a bit questionable as long as she likes them, so it feels like his subconscious might start trying to generate helpful upgrade options that would freak Adam out a bit.
In this case, prompted by her wondering how to weaponize the Warehouse's dangerousness, perhaps:
Void Vent (-200 wp, -50cp) Provides a portable hole that, when attached to a surface, can be toggled on or off to form an opening to the outside of the Warehouse into the Void. When active, conceptually erases everything in a rough cone in front of it.
WARNING: Can kill the Jumper through nearly any perk. Likely to destroy souls. Resurrection perks may not function perfectly, if at all. No benefit will be gained from things destroyed by the Void that would normally be gained from destroying things. Pierces nearly all forms of damage resistance, including fiat protections, including on items. Extent and range of destruction is unpredictable. The Void can permanently damage items, abilities, and other perks affecting things within the destroyed region. Observing the Void through any method is not advised. May kill or draw the ire of local gods and similar entities.
I don't think Sarah would use it, but I think having the option (available, even if not purchased) would make her feel better. Also, it would be mildly amusing.