How to adjust all admin pages to use same creds?

It's a bit of a pain to log into the various admin status pages:
- zend opcache
- memcache
- php-fpm
- nginx pagespeed # I did see the note about needing to be IP-protected

I'm thinking about making life a little easier on myself, as I only just now noticed my opcache was running out of space and I want it to be easy for me to check these pages so I notice sooner next time...

Had a few questions:

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1) if I want to make them all have the same username/passwords, will this create problems when upgrading nginx or php? Thinking about making a /usr/local/nginx/html/admin.html page that links to the different status pages, and if they all have the same creds, then once I'm in and the cookie is set I can access them all no problem.

2) Where is the nginx conf file that locks down the memcache_xxx.php file? I grepped but wasn't finding it.

3) Any reason to not move them to /memcache.php /opcache.php etc? They'll have strong enough passwords, and I'll probably turn on IP-based protection, wasn't sure if there was another security risk I was unaware of with easily guessable paths, or if modifying these paths will create conflicts when upgrading nginx/php.

 

I never bookmark anything honestly. Plus all my passwords are in Lastpass, I like to keep them there and not worry about keeping updated other places as well.

Any hints on where the memcache_xx.php file gets locked down?