Hi, that is an interesting concept.
Many of these sites offer authentication tokens, which would allow links to login. Which could then be used to offer a grand admin access to various tools on the sites.
For instance, email logins do this, as does Wordpress.
By having an admin panel, where a user could select a domain, the panel could be populated with links to these pages. It would have to be very bespoke to the sites being monitored. To create a general tool may be tricky. For instance, domain name details can be masked by some registrars and others not, so some domains it would be easy to get that data and others it would not be possible
I am working on a CMS, using PHP/MSQL backend, with JQuery and Bootstrap frontend. My tool could in theory handle the types of task you want. At the moment it allows access to Wordpress, emails, stats software (in my case Piwik) and other features. I could modify this to allow a logged-in user to select a domain to load and for the admin panel to switch workspace to point to the tools for that domain.
Would you be interested in this?
I have over 15 years experience in professional software development with some of the most reputable companies in the industry, the latest being Intel.
Kind regards,
Will