'sudo' and 'doas' are inline connection methods in TRAMP, so no need for SSH to localhost. Curious that systemd-run isn't already supported, but I imagine that will quickly change.
I like to have one of my tmux windows be a sudo session with emacs running as root and mostly used to run emerge world or apt update etc. also a window tailing all the logs. I haven’t been on a machine where more than one admin was logged in at the same time in quite some time.