Now considering a normal take off with two engines , for some reasons you decide to reduce thrust at 800 AGL ( noise abatement, fuel saving policy etc..)
Should an engine fail at that moment? Are you protected?
Protected from what?!? If you decide for some reason to do something NOT according to accepted standards, what "protection" do you expect?
Reducing thrust for climb does NOT save fuel, because it reduces climb rate and acceleration to best climb speed.
Standard noise abatement profiles do NOT require thrust reduction below 1,000'.
Why would you put extra stress on your remaining engine by using APR, solely because you decided to do something nonstandard?