1
If I'm understanding you aright
you want things to monitor your system as well as a system tray to let other software stick icons in
I think that the norm, dating back to X11, is to have an applet for the dock/wharf/bar/whatever-you-call-it that provides a system tray.
I'm currently using waybar in sway, and it has a system tray function and supports hyprland. The only programs I can think of off the top of my head that I've used that have applets that don't are conky and GKrellM.