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Stopping sticky fingers can be like playing whack-a-mole, no matter what you do they'll pop up elsewhere.
FWIW there are plenty of inexpensive auto alarms that use a small radiopager when the alarm is tripped. You could rig one to the companionway hatch (which should be locked anyway) to page you if someone breaks the hatch open. Limited range, probably up to a mile in clear sight, and "more stuff" to carry. But an option.
Keep things secured, keep a low profile, and just as with your car, don't bother parking it and walking away in a neighborhood you can't trust. There ARE some places better left unvisited. And if you can't replace, secure, or afford to insure something, maybe it is worth buying something less expensive to start with.