Best option for this is probably an electric strike plate. Installation on these is more complex than the prebuilt smart locks, but it can work fine and is relatively inexpensive to do. In these cases you are using the existing knob/handle, you’re just changing the way the lock is released.
There are several community members who have done it. See, for example,
I know there’s at least one more of these on the quick browse projects list for locks:
If you don’t want to install this yourself, the companies that do automatic doors for people in wheelchairs can typically do just a strike plate option , but that’s going to cost a lot more than the DIY project.
The only thing is that there’s no combination lock option with this. You’re just going to have a single unlock command. You can trigger that from Geopresence or a keyfob or just the SmartThings mobile app, but if you want to have different codes for different people you would need to also add a keypad like the iris where you would enter a code which then tells SmartThings to release the electric strike. So just comes down to the details of what you want.