Accessing repositories hosted on AWS

Hi,

We're running Red Hat Satellite 6.6 on a corporate LAN that's firewalled from the Internet. Usually when we want to add a 3rd party repository, we whitelist the address (or fqdn) of the repo and sync it. When the repo lives in AWS (Cloudflare?) this method doesn't work as the fqdn of the repo is an alias for a huge, ever-changing list of addresses. A couple of examples are:
repo.mongodb.com
rpm.datastax.com

I've considered running a Squid proxy on the Internet side of the firewall but I don't think Red Hat Satellite provides the means to apply proxy configs to specific repositories. Can anyone recommend a solution?

Thanks!