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The security mitigation my in-laws use is to have their burglar alarm turned on for downstairs only at night.
I became aware of this the first time I stayed there and needed a dump at 02.00. My wife forbade me from using the upstairs john and sent me to use the downstairs, cue sirens and flashing lights waking the whole house as I was mid-crap. -
Our conclusion was the odds of being at home when someone decides to make use of the door window are fairly slim / we'd be alerted to the noise fairly quickly, so having the thumb turn deadbolt out of easy reach of the window meant it'd always be easy to leave in case of fire, slow if someone did decide to do us over - first smash, then two locks gives us a minute or two.
The Banham's allows you to lock it so that it can't opened from the inside: that's the solution for when we're away: get through the tiny window but not be able to open the lock from the outside through the door.
Pointless spending that much money when they can just stick something solid through the glass and reach through to unlock it. ERA is more than enough, IMO.