Its not just about protecting it at home. This has been going on for years. While the OP isnt keen on fitting an alarm and the benefits, increased security is the only way forward. Tratterers must increase security above the standard fit which to be frank is no betterer than a garden shed with a padlock and one of those coat hanger wire style staple locks with the screws on show. The type yer can lever oft with a screw driver. Or pull the door and the screws give up.
Tratter parts theft has continued for decades. Lack of security makes them too easy to nick. Bolts on show makes them too easy to strip. The OP finks she will recognise her doors but thems who have been around for years know different. Historically police have required photo or video proof they're yours. Same for wheels and other parts stolen. Marks and dents identify them.
Parts stolen day or night. At home or in car parks, side of road... We've seen it all over the years. Towed away or given a push to roll away and start further down the road. As a fellow LR owner it annoys me to see it happen to others in our community. If owners refuse to secure their vehicles then there's no hope. Especially if they continue to buy second hand parts. Puma and td5 bonnet sellers on ebay with every colour available are a good example.
The police are fully aware of the situation. They have had their own tratters stripped anorl. Ere's one of many.
www.dailymail.co.uk/news/article-3763756/amp/Land-Rover-parked-outside-base-stripped-bonnet-five-doors.html
Yer can hide yer head in the sand and pretend its not hapoening but it is. Tesco car park. LR show car park. School car park. Train stations. Dunt matter where yer leave them, robbers know security is poor. Doors unbolt while locked. Remove headlight to disconnect the horn. Its been covered hundreds of times each year on ere since LZ was born. Leave a valuable dog inside and they take that anorl. Roof racks, winches, ladders... Bolt on jewellery which attracts magpies. I'm not giving the game away by saying this. Robbers already know this. Sadly not all owners do.
I get mocked on ere for suggesting etching windows. Its obviouse they can get round it by changing the glass but that costs money or requires another theft. We've seen the industrial strippers at work. Police have even caught them. But there's more out there and they will happily strip or take yer vehicle with ease. The choice is yours tratterers. Fight back or claim on yer insurance.