A discussion worth having, even though we've talked it before. The problem exists, it's growing. It's broadening. It's disheartening. Is there a fix?
Doc I've been reading through this thread and I most certainly understand your concerns. I bet many biker's in or near your location share your fear of loss or damage to their motorbikes. Seeing more wardens about the area(s) surely sends up a red flag. Sadly, I have no secure answer for you. But, I will suggest (if you can afford) to purchase the-Best-of-the-Best Insurance - Comprehensive/aka/Fire and Theft. Collision is a seperate entity (but sometimes goes hand in hand with the purchase of Comp cvg) if it's Not a package and not required, than Collision cvg up to you (consider age of bike, etc).
I know insurance paperwork would be a p.i.t.a. (pain in the a_ _) should a claim be made. But that's true of everything today - paper paper paper!
To answer your question,
My scoot is parked in my garage. My townhome community (500 units) is in the Core of a fairly unstable town that's surrounded by (all kinds of) Bad to the bone Folks. In the evening whilst walking around the block after dinner's meal you take the dog, pepper spray, a walking stick, portable alarm or ? with you. Not the way to live but......sometimes living arrangements can't be changed or helped (not right away, anyway).
I have thought about what I'd do IF I had No garage.
I'd still carry the best insurance. At home, I would sandwich my scoot between my house and the front end of my truck then chain them together. I'd place my "grip lock" on the front brake lever to slow things down more. I would place it on center stand, bars locked and Fully cover it (securing it thru grommets).
I would have a motion sensor light high (out of reach) on the house above it. Inside my home it's wall switch would glow red if the sensor light triggered. Yes, I'm aware of false triggering (wind rain snow animals) but whatcha gonna do 'bout that?
Hmm...Maybe call my present household Alarm Company to see if another switch could be wired in? Got to think of possibilites of that one
Parking elsewhere? Not often but I do and usually it's within eyesight. Also I'm picky about the park spot. Once found Bike goes on center stand w/bars locked. Nothing is visible to grab 'n go = steal. Grip Lock gets fastened to rgt grip and front brake lever. I'm not gone for long.

Ok, sometimes longer

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Ok, nuff from me. Sadly, Other's have Experience. Let's hear from them....please