What urgent outages are you having that can't be circulated with a quick "hey is ___ down for you" in a shared org channel? Also, you still have to get up and walk over to the hubbub to find out what's happening, then walk back before digging into the issue - in that time you could have just read the slack message and been fixing.

You're inventing solutions to a problem that actually worsen the issue.

edit: also, automated alerting solves literally all your problems here - and that should be an investment even if you're at a company with 100% RTO. Your first line of alert will still be digital in that case. If you're waiting to hear panicked seatmates to solve issues you're sure not worried about immediacy.