Guacamole is a browser based third party remote access tool for system admins which provides easy access to hosts in all VPCs, across accounts and regions. It is used by systems administrators in corporate environments behind restrictive proxies to access their cloud services. The facts it uses port 443 makes it easier to manage egress on premise, and ingress in the cloud.
Guacamole is available on the AWS Marketplace at around 20c per hour