Until such a time comes upon which Wyze does allow such, which may be doubtful near term.
I don’t have a Wyze doorbell, but you could at hang an OG or V4 above a door of power access allows. Or if you already have Wyze cams outside with siren capability.
Make a couple automation Shortcuts, siren on and siren off, put the shortcut buttons on a secondary phone screen with phone widgets,
See if the solicitors want to stand there and listen to it.
I have 13 setup, one button on, one button off indoor and outdoor all go off at once. 
