Create a wireguard mesh network between a set of projects and some outside network to allow for private networking. Allow outside peers i.e. a relay in an aws account or a local / on-prem machine.
something along the lines of https://fly.io/docs/reference/privatenetwork/#private-network-vpn
Alternatively some sort of tailscale proxy integration would achieve the same thing. Check out how they are enabling usage on heroku. https://tailscale.com/kb/1107/heroku/
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