Close^
If theres not enough space for a bar over the latch, you could bluff that theres one fitted, a bit like fitting a dummy security camera.
Get some dome head m5 coach bolts. Cut them down and glue them into shallow holes,
having the heads showing may look like there's extra reinforcement for the night latch. Especially if there's the kickstop bar over the mortise lock.
Autocorrect!? good idea about the bolts but thinking about it a bit more i might buy the generic yale bar and cut the middle of the lock section out to clear the snib button, it will still strengthen the door and a bar for each look will be a visual deterrent.
Close^
If theres not enough space for a bar over the latch, you could bluff that theres one fitted, a bit like fitting a dummy security camera.
Get some dome head m5 coach bolts. Cut them down and glue them into shallow holes,
having the heads showing may look like there's extra reinforcement for the night latch. Especially if there's the kickstop bar over the mortise lock.