Ask HN: Is it possible to use your own Postgres instance (homelab) with Heroku?

I have looked at Heroku Data Links, but it seems like it only allows Heroku Postgres<-->Heroku Postgres, and apparently I can specify a DATABASE_URL that is located where I want, but I would like to have a VPN of some kind. Is this possible?

Alternatively, I could set up a VPC in AWS with an EC2 instance that can talk to my homelab db instance, and then just write an HTTP interface when I need the Heroku app to get data from my homelab postgres instance, but this seems a little convoluted.