Multisite, Login Security for mapped domains

Hey guys, hopefully someone has some wisdom they can offer on this…

Normally on a single site install of wordpress I like to use a security plugin to rename the wp-login page to something harder to guess. Security through obscurity – works great!

But on a domain-based, multisite install when mapping sites to client’s domains is a different story. As far as I can tell none of the popular Security Plugins (All in One Wp Security and Firewall, Wordfence, Bulletproof Security, iThemes Security, etc.) offer a feature that will obscure or rename sub-site’s with the id of 2 or greater login page when using the “mapped Domain” selection for the login mapping” of WPMUDEV’s Domain mapping plugin.

So what you end up with is which is the desired result, but for the rest it’s still,, and so on.

Does anyone have any insights on how to achieve this behavior?