As fun and thematic as the idea is, this jammer has a few mechanical and semantic problems:
"Operates as an Area Jammer (Device Rating 2; p. 441, SR5), but instead of inhibiting wireless functionality, reduce a DR to zero, indicating that the system’s audio (if any) has been overridden."
Note that the way it's written it sounds as if the Jammer Rating is independent of the effect - which is defined as setting a DR to zero.
This is vastly more powerful than a regular jammer. Device Rating 0 means that Dataprocessing and Firewall are reduced to 0 as well. Condition monitors are also dependent on DR. Likewise that will make PAN's break down since a DR 0 device can slave 0 devices.
Then there is this little rule: "If a device is completely unattended, the Device Rating stands in for any Mental attributes an icon needs but doesn’t have. For example, a device that an owner sets and forgets, like a door lock, uses its Device Rating in place of Intuition as part of the defense pool against a Control Device action."
And since you can't exempt yourself from this barrage, suddenly all your own gear is completely vulnerable against attacks that originate from outside your bubble...