I've been doing the same for a while, despite the fact that C-\ is in fact sort of already "taken" by default (SIGQUIT). That's not something I use often, but

I've been doing the same for a while, despite the fact that C-\ is in fact sort of already "taken" by default (SIGQUIT). That's not something I use often, but when I want it it's still easy enough to get by just sending C-\ twice. The only downside is occasionally (whether by accidental double-triggering or hitting C-\ out of habit when not actually running screen) killing foreground processes by mistake.