I can see where OP is coming from but I also think the benefits of an alarm out weigh the fluke chance of a give away.
Even if it does give away a claimed bedrock base, I don't see and issue unless the person is cheating in some way.
Easy alternate solution to keep everyone happy!
Land claim alarm sound should be configurable by players/server host.
Either in server config or in a UI that can be accessed on the LCB itself.