A lot of things Charm is doing is pretty neat, but until they're packaged by major distros (my home distro of Debian still has none of these; and for such a niche tooling, I'm not using your third party Debian repo), they're hard to fit into anything I expect to run anywhere.
Also, have you ever considered rolling your own pager that can self file watch and remember scroll position across watch iterations? The Glow markdown reader is neat, but I'd like to use it with vim in a way where :w automatically refreshes Glow running in another tmux pane.