If it can be monitored by myself that really helps. Easy enough to install a system to just monitor the safe or just the strong room - power the system and supply a backup battery internally with a door and motion sensor internally so even if they cut their way in it'll still trip. If it's not actually law that gives a lot better ability to work with the AO in sign off.
I was thinking along the lines what your friend did. In the case of a large closet it could then be repainted to match how it originally looked at only the loss of 40mm of depth/width/height at any point internally, so really wouldn't be noticeable to anyone afterwards.
If I do have to buy an E cat safe that's a good idea as well, since I can't see myself spending enough to buy the size of E cat safe I'd want!
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