I don’t think that the beacon works that way. The way I interpreted the comic the beacon has been active for the two years and still no help arrived.
Destroying it doesn’t really change anything, most likely it wasn’t working anyhow because otherwise you aren’t stranded for two years. It might just make it easier to accept rescue isn’t coming. And doing it voluntary because you prefer the lifestyle could be good moral boost.
But yes, if you are voluntary on an island you want means to contact help. What Masafumi Nagasaki did sounds pretty sweet sometimes. Living naked and alone on an island just getting groceries every few weeks for 30 years.
The type of building is irrelavant to the problem. Anything that works for apartment complexes works just as well for a single family house. It’s always the land underneath that’s the issue.
And at the ond of the day any solution that include getting rid of landlords comes down to the government seizing “unused” or “inappropriately used” land more aggresively. Something that just doesn’t sit right with most people.