Just a crazy thought, but what if Slack (just using Slack as an example) could provide a dongle or 1U server you can put in your server room which works as a pr

Just a crazy thought, but what if Slack (just using Slack as an example) could provide a dongle or 1U server you can put in your server room which works as a proxy for Slack and fallback for clients should Slack be down. This could automatically be updated and maintained by Slack. If you have several sites and no VPN you could install this at all locations and connect them together so you can continue as normal whenever Slack is down and if Internet is down at least you can use it with everyone in your local network. Might be difficult to sync it back to Slack when everything is up and running again though ...