To the best of my knowledge, all of the Iris v1 hardware, including keypads, is going to be useless with any systems at all once Iris is taken down on March 31.
You are not alone in needing a luddite friendly means of access / disarming /arming the system. My primary concern is our housekeeper. That sounds fancier than it is, she’s a friend from church that helps us with the housework once every couple of weeks, and pet sits for us as needed for a few extra bucks…
I know I have seen keypads for Smartthings at least the photos of the CES demos, I just don’t think they are ready for prime time and released yet. No idea if / when that will actually happen. I also remember seeing the Atari 1450XLD home computer demoed at CES in 1983. It never hit full production.
Us Iris refugees are left with some very uncomfortable choices to make. Nothing on the market integrates all of the features we knew and loved with Iris. To the best of my knowledge, the Smartthings ecosystem is as close as we can get, at least with any hope of reusing any of the Iris hardware. And that is only certain second and third generation hardware.
Now I am going to reiterate MY UNDERSTANDING which could possibly be faulty, about the differences between the features sets of Smarrtthings vs Smartthings ADT.
Simply put, the ADT hub has the touch screen interface with the “keypad”. There is cellular failover available with paid professional monitoring, which are features we are used to with Iris. Although support for existing Iris hardware does not integrate with the official ADT alerting. However via IFTTT that support, although unofficial is there.
The regular smartthings does not offer cellular failover for any of its services, keypads are an add on via custom programming similar to a windows driver. (Perhaps not the best analogy).
It looks like Scout and Noonlight and the average seems to be about $19.99 / month. This is absolutely dependent upon constant internet connectivity and of course cloud services being up. This can be addressed using a dual WAN router with cellular failover.
With any camera monitoring , assume you are using at least 3 Ring cameras and want logging / video storage, thus you opt for the $10.00 / month or $100.00 / year service. You are at $29.99 / month for services. Yes that is cheaper than the $45.00 month that you would pay for ADT Total Security Bundle + Ring video storage. However you get cellular backup for the extra money so is it really that bad?
I cannot speak to Abode, however I can say that ADT and Samsung are both well established companies with less of a chance of failing in short order. Obviously not impossible, but less likely.
Just from MY personal comfort level, I am happier I guess you could say, going with ADT Smartthings. I have the one door that I want the luddite visitor using and I can mount the hub close enough to that door if I can set a delay, they can easily get to the hub and disarm the alarm using the built in keypad. (On the wall next to the smart thermostat). Due to the layout of my house, that point is actually pretty much center of the house, equidistant from front, and back doors… But my layout is odd…
And lastly, reconsider your determination to have a keypad at all. The ADT hub to my knowledge can be paired with an ADT keychain remote to control alarm functions.
So long story short, there appear to be a LOT of options available to us Iris orphans, however whatever replacement systems there are, there WILL be some difference from what we are used to. We need to determine for ourselves what our absolute must haves, and can live withouts are. My needs will likely be different from yours. Good luck with your migration and enjoy the new system!