How to Disarm SHM via Keypad?

Yes all of them do, in the posts in there you’ll find some comparisons of the keypads, for example this is one post:

The new IRIS v3 however has a quirk, if you don’t need the Siren I would avoid it since it needs to be armed before it can disarmed and vice versa, where as other keypads you can arm/disarm multiple times (there are advantages to this since you can create custom actions for each arming button through LUM).