Cockpit has a "remote" host connection feature solving this exact pain-point - "Just point me to a server":
You install the Cockpit web service on one host (along with its backend and extensions), and on other hosts you may have - install only the backend of the stack (4-7 packages available via deb backports & other dist repos). The web front host is then able to access any other machine via ssh (if keys and policies permit that) and display info or manage that host. All ports aside from the web front and ssh between your hosts remain as is. It is a decentralized design.