This is great stuff -- we're adding .ssh/config automation to the next major rev of https://Userify.com (we're still in beta/MVP mode but coming out soon) so that you can automate each user's .ssh/config on the jumpbox/bastion based on the nodes/clusters that each user can log into. This same mechanism could be used to deploy .ssh/config on your Mac/Linux box.. but this is a really cool trick. wonder if it could be added to Userify somehow..