Following the advice in FL-2893, I was able to update cinnamon and the bits of gnome that it relies on without running into systemd related blockers. However, following the update, I'm no longer able to launch or use cinnamon and am faced with a fairly nondescript error that reads:

Do you want to restart Cinnamon?
Cinnamon just crashed. You are currently running in Fallback Mode.

Searching online shows that this error has been a relatively common occurrence for a number of previous updates to cinnamon, but I am unable to connect it to any specific component failure or error and it is quite vexing to debug.

I see in my syslog:

Oct 22 11:20:21 [cinnamon-session] Gtk-WARNING: Theme parsing error: gtk-widgets.css:264:30: not a number_
Oct 22 11:20:21 [cinnamon-session] Gtk-WARNING: Theme parsing error: mate-applications.css:37:23: 'none' is not a valid color name_
Oct 22 11:20:23 [cinnamon-session] WARNING: Application 'cinnamon.desktop' killed by signal 15_
Oct 22 11:20:24 [cinnamon-session] WARNING: App 'cinnamon.desktop' respawning too quickly_
Oct 22 11:20:24 [cinnamon-session] CRITICAL: We failed, but the fail whale is dead. Sorry...._

I see nothing of note in Cinnamon's glass.log or in any other log. Is there somewhere else that I should be looking?