I had the same issue. My door is 3" thick and the Kwikset Z-wave lock had an electronic strike but does not have a long enough key to engage the strike. So, I ordered a Baldwin Boulder 8252 Electronic Dead Bolt which fit my door. Now comes the fun… I also purchased a Kwikset Z-Wave dead bolt for the wave card. It’s very easy to remove the card from the Kwikset lock and put it in the Baldwin lock. The insides are essentially identical. Now, the Baldwin lock shows up in mios as a kwikset lock but it all works just like the kwikset z-wave lock would.
I suppose this is an overly expensive way to go about this but I was driven mostly by simply making it work. I am also able to use the kwikset lock that is missing the z-wave card elsewhere that I don’t need to manage from mios so it’s not that bad.
Keep in mind that there is absolutely no support for doing this and when researching, I couldn’t get anyone to tell me anything about it. Hope that helps!