Aspecting by location, If an urban shaman casts in the woods, does it make a spell? Options

[Tanegar]

I'm working on a concept for a custom-tradition urban shaman. I would like to modify the Aspected Magician quality from Street Magic (p. 26) to reflect the fact that he can't really use his mojo outside the city. I've come up with a couple of options:

A) Location (City) Aspect: The character takes a -4 dice pool modifier to all magical tasks (spellcasting, conjuring, assensing, etc.) when not in an urban or suburban area.

B) Location (<specific city>) Aspect (e.g., Seattle Aspect): The character takes a -4 dice pool modifier to all magical tasks (spellcasting, conjuring, assensing, etc.) when not in the Seattle Metroplex. If in another city, the modifier is reduced to -2 (reflecting fundamental similarities among all cities).

What BP bonuses would be appropriate for these qualities? Is option A strict enough to qualify for the 10-point bonus, or do they conform to the 5/10 standard given in Street Magic?