There are lots of such (motion-sensing) alarms. They typically go for $10-$50 CAD. It's not a new concept. But they're dumb--just a bunch of electronics triggering on movement. You can manually adjust the sensitivity, but then they either become hyper or they miss subtle attacks (eg unmounting them)!
And they're only beepers. Regardless of the 120 dB etc they claim, a small size means puny loudness. That might startle me and you, sitting at home, or when testing them within hearing range of the neighbours; but they'll have zero effect on a guy desperate for quick cash.
Mine has a large siren, and a huge amount of firmware analyzing all the movements; it's the first of its kind. The videos show sneaky attacks (slow rolling, gentle lifting, attempts at disassembly, removing the front wheel) as well as violent ones (bolt cutter, angle grinder--though, admittedly, there's not a lot one can do about the latter).
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I was puzzled by the phrase, "your unfunded engineer"; I thought you're replying to someone else. _I_ am the unfunded engineer! Plus vendor, manufacturer, sales, support, accountant, architect, designer, coder, tester, etc etc etc.
As for East Van: Yes, all of Vancouver (BC) has a huge problem. Most of it is casual-but-widespread, but there are organized gangs as well. MTB/DH (single-track) used to be the high-prize game; now, ebikes and cargo bikes.
If, where you are, there's no need for locking bikes, there may be for ATVs, tractors and such. Hanging this from the bottom (or such hidden location) could help with all the thefts of agricultural/recreational equipment.