Warren, thank you for your response, somehow I missed the notification about it earlier.
I will try one FE599 with a manual deadbolt that I already have. The idea is to use the deadbolt when needed, and rely on FE599 other times: i.e. someone will need to enter the house at the known time, I can create a code for them vs. leaving a key under the mat.
I agree that deadbolt is safer and I have more doors, for which BE468 would probably make more sense.
I created a different thread with more questions about FE599.