For a while now, I've been playing with the idea of making this a subscribed or an invited blog. And I am still unable to figure out a good way to do this. The only option now is to make it private, invite the handful of readers whose email address I do have and hope that the rest will simply ask.
But after a week of trying this, what I realised is that anyone who potentially tries to reach here gets a cold “This blog is open to invited readers only. It doesn't look like you have been invited to read this blog. If you think this is a mistake, you might want to contact the blog author and request an invitation.”