OP, is your house 3 storey perhaps??? are the doors self closing???
i wonder if its specific to self closing fire doors required in 3 storey buildings... ie maybe the keyhole compromises the integrity of the fire door.
Are there locksets fitted to the doors with a corresponding strikeplate on the frame? If so, have the doors be routed out to allow a key to opperate the lock? If this is the case it's a very simple job to change the handles (so long as you use the same models or find others that will cover the srcew holes in the door).
Hope this helps...
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