Unfortunately no. The Armed\Disarmed state of the HMS (Disarmed\Home\Away) is strictly quarantined from any Wyze Rule automation or Trigger\Action of any automation assistant (Alexa, Google, IFTTT).
UPDATE: There are now Wyze Rule Triggers available for the Disarmed\Home\Away modes of the HMS.
This has been one of the Wishlist items for some time now:
However… I am liking the key fob for other automation things… And it would work awesomely for this siren application!
Going to bookmark that little gadget into my project file! Thx!